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UM0250
User manual
Getting started with the ST7
Low-speed USB/RS232 Evaluation Kit
Introduction
The Low-speed USB/RS232 Evaluation Kit (STEVAL-PCC02V1) has been created to
provide a complete reference design for a serial port bridge as well as an evaluation board
for ST72F63B/60 devices in QFN40 package. This application is used to interface between
devices with a serial port (RS-232 type) and a host computer USB port. USB data transfers
comply with HID-class protocols.
The bridge is based on a USB low-speed microcontroller manufactured by
STMicroelectronics which provides a maximum guaranteed USB transfer rate of 800 bytes
per second. Flow control has therefore been implemented to ensure data transfer integrity
when interfacing with the serial port at rates up to 38400 bits per second (bps).
The bridge application is evaluated on a PC by running a dedicated applet that controls and
monitors data transfers on both the USB and serial COM ports.
The included hardware provides In-Circuit Programming (ICP) capabilities for the
microcontroller and almost all the MCU's I/Os are available on expansion connectors to
evaluate different applications.
The RS-232 part can be separated by removing the appropriate soldering joints (shunts).
This can be used to modify certain firmware or hardware parameters for evaluation or
customization purposes.
The following development tools can be ordered separately: assembler, linker, C compiler,
source level debugger, hardware emulator, programming boards and gang programmer. For
ordering information, see our website at http://www.st.com/mcu or contact your local sales
office.
July 2006
Rev 1
1/12
www.st.com
Contents
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Contents
1
2
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2
Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3
Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4
Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.1
Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.2
Data transfer via PC serial port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.3
In-Circuit Communication (ICC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Running the Low-speed USB/RS232 Evaluation Kit . . . . . . . . . . . . . . . 6
2.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Low-speed USB/RS232 evaluation program . . . . . . . . . . . . . . . . . . . . . . . 7
2.3
2.2.1
Device Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.2
Data Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Adding extra circuitry on expansion connectors . . . . . . . . . . . . . . . . . . . . . 9
3
Low-speed USB/RS232 Evaluation Board diagram . . . . . . . . . . . . . . . 10
4
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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Getting started
1
Getting started
1.1
System requirements
In order to use the Low-speed USB/RS232 Evaluation Kit with the Windows operating
system, a recent version of Windows, such as Windows 98, Windows Millennium or
Windows 2000 must be installed on the PC.
The version of the Windows OS installed on your PC may be determined by clicking on the
“System” icon in the Control Panel.
Important: When running the HID evaluation board applet provided in the package, verify
that the correct version of the HID.dll file is installed:
1.2
●
Windows 98: HID.dll - Version 4.10.1998
●
Windows 98 SE: HID.dll - Version 4.10.2222
●
Windows Millennium: HID.dll - Version 4.90.300.1
●
Windows 2000: HID.dll - Version 5.00.2134.1
●
Windows XP: HID.dll - Version 5.1.2600.0
Package contents
The Low-speed USB/RS232 Evaluation Kit includes the following items:
Hardware content
●
One evaluation board with ICC, USB and Serial connectors.
●
One soldered ST72F60K2U1 low-speed USB microcontroller device (QFN40 package).
This is a FLASH device allowing up to 100 reprogramming cycles. The ST72F60K2U1
is delivered already programmed with the evaluation firmware.
Software contents (Contact the Sales Office or www.st.com for the most recent version)
●
PC executable software for evaluating the USB/Serial Port Bridge. The source file,
written in Delphi, is provided as an application example using the HID driver.
●
ST7 firmware (C source code) for the ST72F60/63B
Documentation (Contact the Sales Office or www.st.com for the most recent version)
1.3
●
ST7260 and ST7263B datasheets
●
PCB production data
●
ST7263B/ST7260 flyer
●
This Getting Started Manual
Software installation
Install the Bridgels.exe file on your computer.
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Getting started
1.4
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Hardware installation
Figure 1 shows the location of the main components of the evaluation board. The schematic
drawing is given in Figure 6: Low-speed USB/RS232 Evaluation Board schematics on
page 10.
Figure 1.
Evaluation Board Layout
ST3222E (on reverse side)
USB Connector & Supply
RS-232 Connector
ICC Connector
ST72F60Kx or ST72F63BDx
USB to Serial Port Transfer
Active LED (Yellow)
Serial Port to USB Transfer
Active LED (Green)
1.4.1
Power supply
The Low-speed USB/RS232 Evaluation Board is directly supplied by the USB Connector
(bus-powered) and therefore does not require an external voltage supply.
1.4.2
Data transfer via PC serial port
When connected to a PC serial port for data transfer purposes, a DTE (Data Terminal
Equipment) to DTE configuration is required. As a result, a cross-wired RS-232 cable must
be used as shown in Figure 2.
The Low-speed USB/RS232 Evaluation Board is equipped with two LEDs that display the
data transfer status:
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●
Yellow/Orange LED: USB to Serial Bus transfer is active,
●
Green LED: Serial Bus to USB transfer is active.
UM0250
Getting started
1.4.3
Cross-wired serial cable connection diagram
6
1
5
2
4
3
3
4
2
5
1
9
8
7
8
9
7
6
DB9 female
DB9 female
Figure 2.
In-Circuit Communication (ICC)
The 10-pin connector must be connected to a programming tool in order to program or
erase the microcontroller Flash memory.
For further information, please refer to both the ICC Protocol Reference Manual and the ST7
Flash Programming Reference Manual, available online from http://www.st.com/mcu
Note:
The USB cable must be plugged in to supply the board with voltage.
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Running the Low-speed USB/RS232 Evaluation Kit
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2
Running the Low-speed USB/RS232 Evaluation Kit
2.1
Introduction
The Low-speed USB/RS232 Evaluation Kit consists of two main parts:
●
the physical board,
●
the Low-speed USB/RS232 Evaluation software running on your PC.
First, connect the evaluation board to the PC via the USB cable. As a result, the evaluation
board is enumerated as a USB HID device as shown Figure 3, and is ready to use. You may
be required to insert your Windows CD-ROM.
Figure 3.
Enumeration Result
When you start the Low-speed USB/RS232 Evaluation program on the PC, a graphical
interface is displayed for controlling and monitoring the data transfers on the USB and serial
ports of the PC. This PC software is also used to evaluate the enumeration process and to
set the communication parameters.
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Running the Low-speed USB/RS232 Evaluation Kit
2.2
Low-speed USB/RS232 evaluation program
2.2.1
Device Selection
USB Enumeration
The Device Selection window, shown in Figure 4, displays the following information:
●
Available USB HID devices
All applicable devices connected to the PC are displayed in this window. The ST7
RS232 USB Bridge is displayed if the enumeration has been successfully completed.
●
Device information
This information, obtained during the enumeration phase, refers to the highlighted
device in the “Available Devices” window: Vendor ID, Product ID and Version numbers.
(Refer to the USB Specification version 1.1 or higher). Additionally, as string information is
supported, the Manufacturer name, Product and Serial Number are displayed.
COM port settings
This function selects the COM port used by the Low-speed USB/RS232 Evaluation program
to emulate a serial port communication. The selection None is not fully implemented in
version 1.0.0 of the evaluation software.
Common settings
This function is used to select the baudrate of the bridge in the bridge firmware. If the applet
is used to emulate the serial port, it also configures the COM port of the PC. Otherwise, the
serial port baudrate must be defined as the same value in the other applet or device. The
maximum applicable baudrate for this board is 38400 bit/s.
Figure 4.
Device Selection Window
38400
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Running the Low-speed USB/RS232 Evaluation Kit
2.2.2
UM0250
Data Transfers
Serial Port
The two following items do not apply if None has been selected in the “COM Port Setting”
box of the Device Selection window.
●
PC Flow Control defines the flow control method used by the COM port when the
applet controls the COM port of the PC.
●
Automatic received (USB) to sent (Serial) comparison verifies that the data received by
the USB port is equal to the data sent by the COM port of the PC.
●
Loop: Send Serial, Receive USB is used to perform serial to USB transfers in Loop
mode. Unchecking this box during the data transfer aborts the transfer.
If the serial port is handled by another applet or PC, the Automatic received... box must not
be checked and the Loop box must be checked, depending on the required configuration.
USB Port
These items are validated only if the bridge is connected to the USB port.
●
Hardware Flow Control done by bridge is used to enable/disable the RTS/CTS flow
control performed by the bridge on the serial port.
●
Automatic received (Serial) to sent (USB) comparison verifies that the data received by
the serial port is equal to the data sent by the USB port.
●
Loop: Send USB, Receive Serial is used to is used to perform USB to serial transfers in
Loop mode. Unchecking this box during the data transfer aborts the transfer.
Figure 5.
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Data Transfer Window
UM0250
2.3
Running the Low-speed USB/RS232 Evaluation Kit
Adding extra circuitry on expansion connectors
The evaluation board features two 16-hole connectors (P1 & P2) with all the microcontroller
I/O pins and which together with ICC connector (P3) are giving access to almost all MCU
pins.
These connection points can be used for signal probing or adding extra circuitry needed to
evaluate different applications. The figures in the next section give the definition of these
points for each connector.
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D
C
B
VBUS
DD+
GND
USB CON
J1
100nF
VDD
VDD
18pF
C4
C3
1
2
3
4
18pF
C1
2
A
1
4
10/12
3
1
8
9
7
6
15
16
19
100nF
C10
PD0/AIN8
PD1/AIN9
PD2/AIN10
PD3/AIN11
PD4
PD5
PD6
PD7
PC0/RDI
PC1/TDO
PC2/USBOE
PB0 (10mA)/AIN0
PB1 (10mA)/AIN1
PB2 (10mA)/AIN2
PB3 (10mA)/AIN3
PB4 (10mA)/IT5/AIN4
PB5 (10mA)/IT6/AIN5
PB6 (10mA)/IT7/AIN6
PB7 (10mA)/IT8/AIN7
PA0/MCO
PA1 (25mA)/SDA/ICCDATA
PA2 (25mA)/SCL/ICCCLK
PA3/EXTCLK
PA4/ICAP1/IT1
PA5/ICAP2/IT2
PA6/COMP1/IT3
PA7/COMP2/IT4
VDD
2
4
6
8
10
ICC FEATURE
1
3
5
7
9
P3
10K
PA1/ICCDATA
PA2/ICCCLK
RESET
R6
VPP
ST72F63B_QFN40
ST72F60_QFN40 (Port D not available)
VSSA
VSS
USBDM
USBDP
USBVCC
VDD
VDDA
NC
NC
Vpp/TEST
RESET
OSCOUT
OSCIN
U1
OSCIN
2
10
4
3
USBVCC 5
C8
10nF
VPP
RESET 14
USBDM
USBDP
+ C2
10uF/6.3V
1k5
R2
470
R3
XT1
24MHz_NX2520SA
OSCIN
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PA0
PA1/ICCDATA
PA2/ICCCLK
PA3
PA4
PA5
PA6
PA7
2
32
33
34
35
36
37
38
39
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
13 PC0
12 PC1
11 PC2
25
24
23
22
21
20
18
17
1
40
31
30
29
28
27
26
2
VDD
P1
PC2
PC0
PD0
PB6
PB4
PB2
PB0
R4
220
2
4
6
8
10
12
14
16
2
4
6
8
10
12
14
16
LED1
YELLOW LED
VDD
Header 8X2
1
3
5
7
9
11
13
15
P2
Header 8X2
1
PD7
3
PD5
5
PD3
7
PA1/ICCDATA
9
PA3
11
PA5
13
PA7
15
R5
220
3
LED2
GREEN LED
USBVCC
PC1
PD1
PB7
PB5
PB3
PB1
VDD
PD6
PD4
PD2
PA0
PA2/ICCCLK
PA4
PA6
3
10
11
1
6
2
7
3
8
4
9
5
SHDN
NC
V-
VCC
V+
U3
SHDN
CTS
RxD
RTS
TxD
C1+
C1C2+
C2-
SH6
SH5
SH4
SH3
SH2
Document Number
15.05.2006
Date:
Sheet
PB0
PB4
PC0
PB1
PC1
NC
GND
SH1
ST3222E
C11
100nF
20
14
7
9
16
8
17
19
3
USB-UART Bridge Eval Board
SHDN
100nF
Size
Title
D Connector 9
J2
100nF
C7
C5
VDD
4
1
11
18
1
10 CTS
15 RxD
12 RTS
13 TxD
2
4
5
6
4
of
1
C9
100nF
C6
100nF
Rev
1.0
D
C
B
A
Figure 6.
PA0
3
PC2
1
Low-speed USB/RS232 Evaluation Board diagram
UM0250
Low-speed USB/RS232 Evaluation Board diagram
Low-speed USB/RS232 Evaluation Board schematics
UM0250
4
Revision history
Revision history
Table 1.
Document revision history
Date
Revision
03-Jul-2006
1
Changes
Initial release.
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UM0250
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