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2 in 1
USB 2.0
IN-CIRCUIT
PROGRAMMER
ATMEL
8051
DEVELOPMENT
BOARD
Easy8051A
User’s Manual
With useful implemented peripherals, plentiful practical
code examples and a broad set of additional add-on
boards (Serial Ethernet, Compact Flash, MMC/SD,
ADC, DAC, CAN, RTC, RS-485, etc.), MikroElektronika
development boards make fast and reliable tools that
can satisfy the needs of experienced engineers and
beginners alike.
Software and Hardware
solutions for Embedded World
Easy8051A User’s Manual
MikroElektronika
Development
tools
First edition
November 2006
No part of this manual, including the product and software described in it, may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language
in any form or by any means, except documentation kept buy the purchaser for backup purposes, without the express written permission of MikroElektronika company.
Product warranty or service will not be extended if the product is repaired, modified or
altered, unless such repair, modification or alteration is authorized in writing by
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MIKROELEKTRONIKA PROVIDE THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY
KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PUROSE.
IN NO EVENT SHALL MIKROELEKTRONIKA, ITS DIRECTORS, OFFICERS, EMPLOYEES OR DISTRIBUTORS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES(INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS
OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE
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MikroElektronika assumes no responsibility or liability for any errors or inaccuracies that
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Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
2
CONTENTS
Easy8051A User’s Manual
MikroElektronika
Development
tools
CONTENTS
Easy8051A
with USB 2.0 PROGRAMMER
CONNECTING THE SYSTEM
page 4
INTRODUCTION
page 5
DESCRIPTION OF THE DEVELOPMENT SYSTEM
page 6
Switches and their functions
page 6
Jumpers
page 7
MCU sockets
page 8
Power Supply
page 10
On-Board USB 2.0 programmer
page 11
Oscillator
page 12
LEDs
page 13
Pushbutton switches
page 15
7-segment displays
page 18
Graphic LCD
page 19
LCD 2x16 in 4-bit mode
page 20
LCD 2x16 in 8-bit mode
page 21
RS-232 Communication
page 23
DS1820 Digital Thermometer
page 25
A/D Converter
page 26
D/A Converter
page 27
Direct port access
page 28
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
3
CONNECTING THE SYSTEM
Easy8051A User’s Manual
MikroElektronika
Development
tools
CONNECTING THE SYSTEM
The development system box contains the development system, product CD, USB cable,
RS232 cable and this manual.
Step no.1 The first thing to do is to take the system out of the box. Unpack the USB cable and connect
it to the PC. Please use USB ports on the back of the PC with direct connection to the motherboard.
Step no.2 Install the 8051Flash programmer and drivers. Start the installation from the product CD:
CD_Drive:/product/zip/8051Flash_setup.exe.
Step no.3 After the installation connect the USB cable to the Easy8051A board. You will be asked for
the 8051Flash drivers. Point to them in order to finish the driver installation.
Step no.4 Run and use 8051Flash as it is explained in the PDF document ‘8051Flash programmer’.
After these 4 steps, your Easy8051A is installed and ready for use. You can try to read a program from the chip or to load an example from the product CD:
CD_Drive:/product/zip/easy8051a_examples.zip.
page
4
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
ATMEL
8051
DEVELOPMENT
BOARD
INTRODUCTION
The Easy8051A development system is a full-featured development board for Atmel 8051
microcontrollers. It has been designed to allow students and engineers to easily exercise and
explore the capabilities of 8051 microcontrollers. It allows 8051 microcontrollers to be
interfaced with external circuits and a broad range of peripheral devices, allowing a user to
concentrate on software development.
Figure 1 illustrates the development board. Each component is marked on a silkscreen, both
top and bottom. These marks describe connections to the microcontroller, operation modes,
and provide some useful notes. The need for additional schematics is minimized since all
relevant information is printed on the board.
Figure 1.
Easy8051A
with USB 2.0 PROGRAMMER
Easy8051A development board
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
5
INTRODUCTION
Easy8051A User’s Manual
MikroElektronika
Development
tools
SWITCHES
Easy8051A User’s Manual
MikroElektronika
Development
tools
SWITCHES
The Easy8051A development board features a number of peripherial devices. In order to
enable these devices before programming, you need to check if appropriate jumpers or
switches have been properly set. Switches are devices that have two positions - ON and
OFF, which have a role to establish or break a connection between two contacts. The
Easy8051A development board has two groups of switches.
The first group, SW1, is used to enable SPI communication for interfacing with A/D Converter and D/A Converter and for connecting ADC CS (Chip Select) and DAC CS to microcontroller pins.
The upper four switches of SW2 are used to enable LEDs connected to PORT0, PORT1,
PORT2 and PORT3. For example, if the switch for PORT1 is OFF, all PORT1 LEDs will
be turned off. The lower four switches of SW2 are used to enable the 7-segment displays.
If you don’t need the 7-segment displays in your project, these switches should be OFF.
ON
Group of 8 switches
1 2 3 4 5 6 7 8
Figure 2.
Switch 2 is ON, and other
switches are OFF
Switch is ON
Switch is OFF
page
6
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
JUMPERS
Jumpers, like switches, can break or establish a connection between two points. Beneath the
plastic cover of the jumper is a metal contact, which makes a connection when the jumper
is placed between two disconnected pins.
For example, the jumpers J9 and J10 are used to connect or disconnect Rx and Tx lines to
the P3.0 and P3.1 pins, respectively. A connection is made when the jumper is placed
between two contacts.
Figure 3.
Jumper as a
switch
Jumper is ON
Jumper is OFF
More often, jumpers are used as a selector between two possible connections using a three
pin connector. As illustrated in Fig. 4, the middle connector can be connected to the left or
right pin, depending on the jumper’s position.
Figure 4.
All lines are
disconnected
Left line
is selected
Right line
is selected
Jumper as a
multiplexer
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
7
JUMPERS
Easy8051A User’s Manual
MikroElektronika
Development
tools
MCU SOCKETS
Easy8051A User’s Manual
MikroElektronika
Development
tools
MCU SOCKETS
Easy8051A is delivered with a AT89S8253 40-pin microcontroller. Users can remove this
one and fit a different microcontroller in DIP40, DIP20, DIP16 or DIP14 packages of an
adequate pinout.
MCU sockets
Figure 5.
Note: Since all packages have parallel connections, there must not be more than one microcontroller on the board at a time.
page
8
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
Microcontroller’s pins are routed to various peripherals as illustrated in Fig. 6. All ports have
direct connections to Direct Port Access connectors. Such connectors are typically used for
connecting external peripherals to the board or for providing useful points for connecting
digital logic probe.
All ports are connected to LEDs, push-button switches and pull-up/down resistors, which
allow easy monitoring and testing of digital pin state .
Some pins are connected to other peripherials such as the DS1820 temperature sensor, RS232 communication, 7-segment displays, LCD, etc.
Figure 6.
System connection
SW2
PORT1
P1.5
VCC
P1.5
VCC
ON
CN2
1 2 3 4 5 6 7 8
PORT1
VCC
J2
PORT1
J6
P1.5
PA0
P1.0
PA2
P1.5
PA3
DIP20
P1.4
P1.5
P1.6
P1.7
RST
P3.0
with USB 2.0 PROGRAMMER
DIP40
PA1
P1.2
P1.3
Easy8051A
P1.5
P1.1
PA4
DIP16
PA5
PA6
PA7
AREF
AGND
P3.1
AVCC
P3.2
PC7
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
9
MCU SOCKETS
Easy8051A User’s Manual
MikroElektronika
Development
tools
POWER SUPPLY
Easy8051A User’s Manual
MikroElektronika
Development
tools
POWER SUPPLY
POWER SUPPLY
SELECTABLE
As a power supply source, users can select either a regulated supply from the USB cable
(default) or an external power supply. In case of the USB power supply, the system should
be connected to a PC using the USB programming cable, while the jumper J5 should be set
in the right-hand position.
In the case of an external power supply, the Easy8051A board produces +5V using an
LM7805 voltage regulator. The external power supply can be AC or DC, with a voltage
between 8V and 16V and the jumper J5 should be set in the left-hand position. In Fig. 7
you can see USB and external power supply connectors.
Figure 8. Power supply select jumper
Figure 7. USB and power supply connectors
J5 in the left-hand
position: system will
take power from the
external AC/DC
power adapter.
J5 in the right-hand
position: system will
take power from the
USB cable.
USB
connector
External power
supply connector
REG1
7805
CN7
1
2
1
USB
USB Power Supply
EXT
USB
External Power Supply
EXT
8-16V (AC/DC)
+
EXT
Vin
Vout
USB
J5
5V
FP1
5V
3
GND
2
E1
470uF
C1
100nF
Figure 9. Power supply schematic
C2
100nF
E3
470uF
C9
100nF
DD+
GND
USB
VCC
page
10
VCC
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
USB 2.0
IN-CIRCUIT
PROGRAMMER
ON-BOARD USB 2.0 PROGRAMMER
There is no need for the use of external
equipment during programming, as the
Easy8051A development system has its
own on-board USB 2.0 programmer.
All you need to do is connect the system to
a PC using the USB cable. Then, load your
program into the microcontroller via the
8051Flash programming software, which is
supplied with the board.
Figure 10. On-Board USB programmer
Note: There is no need for manually reseting MCU after programming. The programmer
will reset the MCU automatically.
VCC
1K
POWER
VCC
VCC
10K
USB LINK
VCC
P0.0
P1.2
P0.1
P0.2
P1.3
P1.5
P1.6
P1.7
RST
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
OSCILLATOR
Easy8051A
with USB 2.0 PROGRAMMER
ATMEL 8051
P1.4
VCC
P0.3
P0.4
P0.5
P0.6
P0.7
TO PERIPHERALS
ON DEVELOPMENT BOARD
8051Flash
On-Board USB
programmer
P1.0
P1.1
Reset
100n
1K
SWITCH
VCC CN8
1
VCC
2
D3
D+
4
27
GND
27
USB
USB CONN.
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.1
Switch schematic Figure 11.
P2.0
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
11
ON-BOARD USB PROGRAMMER
Easy8051A User’s Manual
MikroElektronika
Development
tools
MikroElektronika
Development
tools
OSCILLATOR
Easy8051A development board has on-board oscillator circuit for generating microcontroller’s clock input. Within the 8051Flash programmer you can either choose internal RC
oscillator or external clock. External oscillator is connected to the XTAL1 pin of the microcontroller.
Figure 12.
Oscillator
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.5
10K
P1.6
P1.7
P3.1
100n
Reset
RST
P3.0
OSCILLATOR
P3.2
P3.3
P3.4
P3.5
P3.6
74HC04
A
VCC
VCC
F
R7 1M
B
ATMEL 8051
P1.4
VCC
VCC
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
E
Figure 13.
C
Oscillator schematic
D
R8
1K
GND
C11
22pF
X2
8MHz
C12
22pF
OSCILLATOR
Easy8051A User’s Manual
OSCILLATOR
Note: In order to simplify the schematics in this manual, the oscillator circuit is represented by this symbol.
page
12
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
LEDs
Light Emitting Diodes (LEDs) are the most commonly used components, usually for displaying pin’s digital state. Easy8051A has 32 LEDs that are connected to the microcontroller’s PORT0, PORT1, PORT2 and PORT3.
Figure 14.
Light Emitting Diodes
Each group of eight LEDs can be enabled or disabled using the switch SW2. Fig. 15. illustrates the connection of a LEDs to PORT0 of the microcontroller. A resistor is used in series
with the LED to limit the LED's current. In this case the resistor's value is 1K.
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
13
LEDs
Easy8051A User’s Manual
MikroElektronika
Development
tools
LEDs
Easy8051A User’s Manual
MikroElektronika
Development
tools
The LEDs are enabled when the corresponding switch on SW2 is on. When enabled, LEDs
will display the state of the corresponding microcontroller pin; otherwise the LEDs will
always be off, no matter what the port state is, as no current can flow through LED.
VCC
LED schematic Figure 15.
ON
1 2 3 4 5 6 7 8
PORT0 LED
PORT1 LED
CURRENT FLOW
PORT2 LED
PORT3 LED
P0.0
P0.1
RN5
P0.2
1
2
3
4
5
6
7
8
9
P0.3
VCC
P0.4
P0.5
P0.6
VCC
P0.0
P1.2
P0.1
P0.2
P1.3
P1.4
P0.7
P1.5
P1.6
P1.7
10K
RST
P3.0
P3.1
100n
Reset
VCC
P3.2
P3.3
P3.4
P3.5
P3.6
OSCILLATOR
ATMEL 8051
R-SIL 8/9
1K
P1.0
P1.1
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
page
14
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
PUSHBUTTON SWITCHES
Easy8051A has 32 push buttons, which can be
used to change states of digital inputs to microcontroller's ports. There is also one switch that
acts as a RESET. Reset switch schematic is
shown in Figure 17.
Reset switch Figure 16.
Figure 17.
Reset switch schematic
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.5
P1.7
8051Flash
On-Board USB
programmer
RST
P3.0
P3.1
100n
Reset
10K
P1.6
P3.2
P3.3
P3.4
P3.5
P3.6
OSCILLATOR
ATMEL 8051
P1.4
VCC
VCC
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
Figure 18.
Pushbutton switches
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
15
PUSHBUTTON SWITCHES
Easy8051A User’s Manual
MikroElektronika
Development
tools
Easy8051A User’s Manual
MikroElektronika
Development
tools
PUSHBUTTON SWITCHES
Buttons connections to PORT0, PORT1, PORT2 and PORT3 are shown in Fig. 19. Jumper
J6 determines whether a button press will bring logical zero or logical one to the appropriate pin.
When button is not pressed, pin state is determined by the pull-up or pull-down port
jumpers.
In the example shown in Fig. 19, J6 is connected to +5V, therefore pressing the buttons will
bring logical one to the appropriate pins.
PORT0
PORT1
PORT2
PORT3
P1.0
P2.0
P3.0
P0.1
P1.1
P2.1
P3.1
P0.2
P1.2
P2.2
P3.2
P2.4
P0.5
P1.5
P2.5
P3.5
P0.6
P1.6
P2.6
P3.6
P0.7
P2.7
P1.7
VCC
P1.7
P3.3
P3.4
P0.1
P0.2
P1.6
10K
P1.4
P1.2
P1.5
Reset
P2.3
P0.0
P1.4
RST
P3.0
P3.1
100n
P0.4
P1.3
VCC
P1.3
VCC
P0.3
P1.0
P1.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
0V while button
is pressed
OSCILLATOR
P3.7
ATMEL 8051
P0.0
VCC
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
+5V while button
is pressed
J6
Figure 19.
Buttons schematic
page
16
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
On Fig. 20 the J1 jumper is
set to pull-up, therefore
when the button is not
pressed, pull-up resistor
pulls the microcontroller’s
PA3 pin to +5V.
PORT0
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.4
P1.5
P1.6
P1.7
Thus, only when the button
is pressed the microcontroller will sense a logical
zero; otherwise the pin state
will always be logical one.
RST
P3.0
P3.1
ATMEL
A button press causes the
port pin to be connected to
ground (J6 is in the lower
position).
vcc
J1
P3.2
vcc
P0.3
P0.4
P0.2
P0.5
P0.6
P0.7
vcc
EA
0V while pressed
PSEN
Figure 20. Button with pull-up resistor
vcc
J1
PORT0
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.5
P1.6
Easy8051A
with USB 2.0 PROGRAMMER
RST
P3.0
P3.1
P3.2
ATMEL
P1.4
P1.7
Thus, only when the button
is pressed the microcontroller will sense a logical
one; otherwise the pin state
will always be logical zero.
J6
ALE
On Fig. 21 the J6 jumper is
set to pull-down, therefore
when the button is not
pressed, pull-down resistor
pulls the microcontroller’s
PA3 pin to 0V.
A button press causes the
port pin to be connected to
+5V (J6 is in the higher position).
pull-up
pull-down
vcc
P0.3
P0.4
P0.2
P0.5
P0.6
P0.7
EA
vcc
J6
ALE
PSEN
5V while pressed
Figure 21. Button with pull-down resistor
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
17
PUSHBUTTON SWITCHES
Easy8051A User’s Manual
MikroElektronika
Development
tools
8.
7
S
E
G
R
E
A
D
Y
MikroElektronika
Development
tools
7-SEGMENT DISPLAYS
Easy8051A has four 7-segment displays in multiplex mode. Data lines are connected to
PORT0, while each display is enabled through the lower four bits of PORT1.
Figure 22.
7-segment displays
8.
a
Figure 23.
7-segment displays schematic
b
f
g
e
c
DIS3
dp
DIS2
DIS1
DIS0
d
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.5
Reset
10K
P1.6
P1.7
RST
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
OSCILLATOR
P3.7
ATMEL 8051
P1.4
VCC
100n
7-SEGMENT DISPLAYS
Easy8051A User’s Manual
VCC
8. 8. 8. 8.
a
b
c
d
e
f
g
P0.3
P0.4
P0.5
P0.6
dp
P0.7
EA
R20 - R27
10
9
8 7 6
10 9
8 7 6
10
9
8 7 6
10 9
8 7 6
1
2
3 4 5
1
3 4 5
1
2
3 4 5
1
3 4 5
2
2
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
Q1
P2.1
R28
10K
Q3
Q2
R29
10K
R30
10K
Q4
R31
10K
SW2
P1.0
ON
P1.1
1 2 3 4 5 6 7 8
P1.3
P1.2
DIS3
DIS2
DIS1
DIS0
page
18
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
GRAPHIC LCD
CONNECTOR
ON-BOARD
GRAPHIC LCD
A graphic LCD (GLCD) allows advanced visual messages to be displayed. While a character LCD can display only alphanumeric characters, a GLCD can be used to display messages in the form of drawings and bitmaps. The most commonly used graphic LCD has the
screen resolution of 128x64 pixels. Before a GLCD is connected, the user needs to set the
jumper J8 (Fig. 24) to the upper position. The GLCD’s contrast can be adjusted using the
potentiometer P1, which is placed to the right of the GLCD.
Figure 25.
GLCD
Figure 24.
GLCD
selection jumper
In order to enable GLCD,
jumper J8 should be set to
the upper position, labeled
as GRAPH.
J8
GRAPH.
CHAR.
Vee
GLCD contrast
selected
LCD8 contrast
selected
GLCD and LCD8
contrast not selected
VCC
VCC
VCC
P0.0
P1.2
P1 10K
R11 10
Vo
VCC
P1.4
VCC
P1.5
10K
P1.6
P1.7
RST
P3.0
P3.1
100n
Reset
CS1
CS2
GND
VCC
Vo
RS
R/W
E
D0
D1
D2
D3
D4
D5
D6
D7
RST
Vee
LED+
LED-
1
20
P3.2
P3.3
P3.4
P3.5
Figure 26.
P3.6
OSCILLATOR
GLCD schematic
Easy8051A
with USB 2.0 PROGRAMMER
P0.1
P0.2
P1.3
ATMEL 8051
Contrast
Adjustment
P1.0
P1.1
P0.3
P0.4
P0.5
P0.6
P0.7
VCC
D0
D1
D2
D3
D4
D5
D6
D7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.1
RST
E
R/W
RS
CS2
CS1
P2.0
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
19
GRAPHIC LCD 128X64
Easy8051A User’s Manual
MikroElektronika
Development
tools
CONNECTOR
LCD
2x16
ON-BOARD
MikroElektronika
Development
tools
LCD 2X16 IN 4-BIT MODE
A standard character LCD is probably the most widely used data visualization component.
Usually, it can display two lines of 16 alphanumeric characters, each made up of 5x8 pixels. The character LCD communicates with the microcontroller via a 4-bit or 8-bit data bus,
each requiring the use of a different connector on Easy8051A. For 4-bit data bus use, the
LCD should be placed in the upper left of the board, just above the LEDs. The connection
to the microcontroller is shown in Fig. 28 where there are only four data lines. It is important to note that the LCD should be placed or removed from Easy8051A only when the
power is off.
Figure 27.
LCD 2x16 in 4-bit mode
VCC
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.5
10K
P1.6
P1.7
RST
P3.0
P3.1
100n
Contrast
Adjustment
Reset
P2
10K
P3.2
P3.3
P3.4
1
Figure 28.
LCD 2x16 in 4-bit
mode schematics
P3.5
14
LCD Display
4-bit mode
P3.6
OSCILLATOR
P3.7
ATMEL 8051
P1.4
VCC
VCC
GND
VCC
VEE
RS
R/W
E
D0
D1
D2
D3
D4
D5
D6
D7
LCD 2X16 IN 4-BIT MODE
Easy8051A User’s Manual
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
page
20
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
CONNECTOR
2x16
LCD
ON-BOARD
LCD 2X16 IN 8-BIT MODE
When using a character LCD in 8-bit mode, the connector that is shared with the GLCD
should be used. Since this connector has 20 pins and the character LCD has only 14 pins,
special attention is required when placing the LCD. Otherwise the LCD can be permanently damaged.
Figure 29.
LCD 2x16 in 8-bit mode
View from the back:
shows which pins
stays disconnected.
The LCD must be placed in the marked position with two free pins to the left and four free
pins to the right. It is important to note that the LCD should be placed or removed from
Easy8051A only when the power is off. Before attaching the LCD, set jumper J8 to the
lower position. The LCD's contrast can be adjusted using potentiometer P1 which is located to the right of the GLCD/LCD connector.
NOTE: Special attention is required when placing the LCD. Otherwise the LCD can be permanently damaged.
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
21
LCD 2X16 IN 8-BIT MODE
Easy8051A User’s Manual
MikroElektronika
Development
tools
MikroElektronika
Development
tools
In order to enable LCD,
jumper J8 should be set to
the lower position, labeled
as CHAR.
J8
GRAPH.
Vee
GLCD contrast
selected
LCD8 contrast
selected
GLCD and LCD8
contrast not selected
VCC
CHAR.
VCC
P1 10K
Leave four free pins
to the right side
P0.0
P1.2
P0.1
P0.2
P1.4
VCC
P1.5
P1.6
10K
P1.7
RST
P3.0
P3.1
100n
Reset
14
GND
VCC
VEE
RS
R/W
E
D0
D1
D2
D3
D4
D5
D6
D7
1
Leave two free
pins to the left side
VCC
P1.3
Vo
Contrast
Adjustment
P1.0
P1.1
ATMEL 8051
LCD 2X16 IN 8-BIT MODE
Easy8051A User’s Manual
P3.2
P3.3
LCD Display
8-bit mode
P3.4
P3.5
P3.6
OSCILLATOR
P0.3
P0.4
P0.5
P0.6
P0.7
VCC
D0
D1
D2
D3
D4
D5
D6
D7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
E
R/W
RS
P2.1
Figure 30. LCD 8-bit mode schematic
page
22
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
RS232
RS-232 COMMUNICATION
ENABLED
RS-232 communication enables point-to-point data transfer. It is commonly used in data
acquisition applications, for the transfer of data between the microcontroller and a PC. Since
the voltage levels of a microcontroller and PC are not directly compatible with each other,
a level transition buffer such as the MAX232 must be used.
Figure 31. RS232 connectors
In order to provide a more flexible system, the microcontroller is connected to the MAX232
through the two jumpers: J9 and J10. The jumper J9 is used to connect the Rx line to P3.0
pin. The jumper J10 is used to connect the Tx line to P3.1 pin.
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
23
R S- 2 3 2 C O M M U N I C A T I O N
Easy8051A User’s Manual
MikroElektronika
Development
tools
Easy8051A User’s Manual
MikroElektronika
Development
tools
R S- 2 3 2 C O M M U N I C A T I O N
Figure 32.
Connection between microcontroller and a PC
PC
6
RS-232
CON
9
1
5
CONNECT
MCU TO PC
Receive
data (Rx)
SERIAL
CABLE
CONNECT
PC TO MCU
6
RS-232 A
CON
9
8
CN9
SUB-D 9p
4
9
5
1
2
7
3
5
6
1
Send
Data (Tx)
VCC
C18
100nF
E12
10uF
VCC
C2VS-
T2OUT
R2IN
R1IN
R1OUT
T1IN
T2IN
R2OUT
P0.1
P0.2
P1.5
P1.6
J10
J9
P1.7
RST
P3.0
P3.1
100n
C2+
T1OUT
P1.2
P1.4
VCC
16
15
14
13
12
11
10
9
10K
C1-
VCC
GND
Reset
VS+
P0.0
P3.2
P3.3
Rx
P3.4
Tx
P3.5
P3.6
RS232 COMM.
Disabled
RS232 COMM.
Enabled
OSCILLATOR
ATMEL 8051
E10
10uF
C1+
MAX232
E11
10uF
1
2
3
4
5
6
7
8
VCC
P1.3
U6
E9
10uF
P1.0
P1.1
24
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
VCC
P2.1
Easy8051A
with USB 2.0 PROGRAMMER
DS1820 DIGITAL THERMOMETER
DS1820 digital thermometer is well suited to environmental temperature measurement, having the temperature range of -55°C to 125°C and the accuracy of +/0.5°C. It must be placed correctly in the 3-pin socket
provided on Easy8051A, with its rounded side to the
right edge of the board (see Fig. 33) otherwise the
DS1820 could be permanently damaged. DS1820’s
data pin can be connected to either P2.7 or P3.3 pin,
which is determined by jumper J7.
DS1820
There is a mark in the
form of half-circle for
proper orientation of
DS1820 sensor.
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.5
10K
P1.6
RST
P3.0
P3.1
100n
Reset
125 C
P1.7
P3.2
P3.3
P3.4
P3.5
-55 C
DS1820
P3.6
OSCILLATOR
VCC
VCC
GND
VCC
R10
10K
J7
ATMEL 8051
P1.4
VCC
Figure 33.
VCC
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
DQ
DQ line is
connected to P2.7
DQ line is
connected to P3.3
DQ line is
disconnected
Figure 34.
DS1820 schematic
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
25
DS1820 DIGITAL THERMOMETER
Easy8051A User’s Manual
MikroElektronika
Development
tools
ADC INPUT
ENABLED
VREF
4.096V
ON-BOARD
MikroElektronika
Development
tools
A/D CONVERTER
The Easy8051A development system has 4-channel
12-Bit A/D Converter (Analog-to-Digital Converter) with SPI serial interface (MCP3204). In order to
use it the switches 1,2,3 and 4 on SW1 must be
enabled. In order to simulate an analog input, potentiometer P3 should be connected to one of four analog inputs through jumper group J12. MCP1541 is
used as a 4.096V voltage reference for ADC.
A/D Converter Figure 35.
VCC
R18
1K
J11
REF1
AREF
VCC
MCP
1541
E4
10uF
10K
2
U7
3
6
7
Vref
CH2 AGND
CH3
CLK
NC
DOUT
NC
DGND
DIN
CS
14
VCC
P0.0
P0.1
P0.2
P1.3
VCC
P1.4
13
P1.5
12
P1.6
11
SPI-SCK
10
SPI-MISO
9
SPI-MOSI
8
ADC-CS#
MCP3204
ON
5
CH1
VCC
1 2 3 4 5 6 7 8
4
CH0
P1.0
P1.1
P1.2
P1.7
P1.7
P1.6
P1.5
RST
P3.0
P3.5
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
SW1
J12
VCC
OSCILLATOR
P3.7
ATMEL 8051
1
2
100n
CH2
CH3
1
VCC
Reset
CH1
2
R17
100
4.096V voltage
reference
CN15
CH0
GND 2
1
5V voltage
reference
3 VOUT
VIN 1
CN14
A/D CONVERTER
Easy8051A User’s Manual
VCC
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
P3
10K
Figure 36.
A/D Converter schematic
page
26
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
Easy8051A User’s Manual
VREF
D/A CONVERTER
ON-BOARD
D/A Converter (Digital-to-Analog Converter) with
SPI serial interface (MCP4921). In order to use it
the switches 1, 3 and 5 on SW1 must be enabled.
Analog voltage output from DAC chip is connected
to the CN13 connector and it is in range from 0V to
Vref. MCP1541 is used as a 4.096V voltage reference for DAC.
4.096V The Easy8051A development system has 12-Bit
D/A Converter Figure 37.
VCC
R18
1K
J11
REF1
AREF
VCC
MCP
1541
E4
10uF
5V voltage
reference
3 VOUT
VIN 1
GND 2
R17
100
4.096V voltage
reference
VCC
1
U8
VCC
CS
SCK
SDI
VOUT
GND
VREF
LDAC
8
7
6
5
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
P1.4
P1.5
MCP 4921
P1.6
DAC-CS#
ON
SPI-MOSI
1 2 3 4 5 6 7 8
SPI-SCK
P1.7
P1.7
RST
P3.0
P1.5
P3.1
P3.2
P3.3
P3.4
P3.4
P3.5
P3.6
SW1
OSCILLATOR
ATMEL 8051
1
2
3
4
+
-
100n
2
VCC
10K
CN13
Reset
D/A CONVERTER
MikroElektronika
Development
tools
VCC
P0.3
P0.4
P0.5
P0.6
P0.7
EA
ALE
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
Figure 38.
D/A Converter schematic
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
27
DIRECT PORT ACCESS
Easy8051A User’s Manual
MikroElektronika
Development
tools
DIRECT PORT ACCESS
All microcontroller input/output pins can be accessed via connectors placed along the right
side of the board. For each of PORT0, PORT1, PORT2 and PORT3 there is one 10-pin connector providing VCC, GND and eight port pins.
Direct port access connectors
Figure 39.
These connectors can be used for system expansion with external boards such as Serial
Ethernet, Compact Flash, MMC/SD, ADC, DAC, CAN, RTC, RS-485, etc. Ensure that the
on-board peripherals are disconnected from microcontroller by setting the appropriate
jumpers and switches, while external peripherals are using the same pins. The connectors
can also be used for attaching logic probes or other test equipment.
Figure 40.
Example of how to connect external peripheral with flat cable
page
28
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER
1
VCC
Pull-down line
is connected
Pull-up line is
connected
DIRECT PORT ACCESS
Easy8051A User’s Manual
MikroElektronika
Development
tools
J3
2
3
All lines
are disconnected
RN3
P1.0
VCC
P1.1
P0.0
P1.2
P0.1
P0.2
P1.3
ATMEL 8051
P1.4
VCC
P1.5
P1.7
RST
P3.0
P3.1
100n
Reset
10K
P1.6
P3.2
P3.3
P3.4
P3.5
P3.6
OSCILLATOR
P0.3
P0.4
P0.5
P0.6
VCC
1
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
2
3
4
5
6
7
8
9
P0.7
EA
ALE
RPACK8/9
8x10K
PSEN
P2.7
P2.6
P2.5
P2.4
P3.7
P2.3
XTAL2
P2.2
XTAL1
GND
P2.0
P2.1
CN3
Figure 41.
PORT2 connection
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
VCC
HEADER 5x2
Easy8051A
with USB 2.0 PROGRAMMER
page
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
29
Easy8051A User’s Manual
MikroElektronika
Development
tools
If you are experiencing problems with any
of our products or you just want additional
information, please let us know. We are
committed to meeting your every need.
Technical Support :
[email protected]
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or a business proposal, please contact us:
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page
30
MIKROELEKTRONIKA SOFTWARE AND HARDWARE SOLUTIONS FOR THE EMBEDDED WORLD
Easy8051A
with USB 2.0 PROGRAMMER