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Tattletale Installation and Operation Manual
ANSI-C
Section 6 - Hardware and Interface Specifications
Analog Inputs
The Model 8 has eight analog inputs to a 12-bit A-D converter. The data sheets on
major Model 8 IC’s are in the appendix of this manual. Table 6-7 shows the pins on
the converter strip used by the IO-8 and the PR-8 boards.
Table 6-7: Analog Input Pin Specifications
IO-8
Pin #
PR-8
Pin #
Analog Input Pin Function
---
108
Negative reference for the A-D in bipolar mode (AVSS)
Tied to AGND via jumper J1
B20
109
VREF (should be between 2.5V and 5V)
B19
107
A-D chan 0
B18
106
A-D chan 1
B17
105
A-D chan 2
B16
104
A-D chan 3
B15
103
A-D chan 4
B14
102
A-D chan 5
B13
101
A-D chan 6
B12
100
A-D chan 7
---
99
REFADJ
B11
98
Analog Ground (AGND)
Main UART
At power-up the hardware UART (at RS-232 levels) is programmed for 9600 baud,
eight data bits, one stop bit and no parity. The 14 TPU lines can be set to any standard
baud rate up to 500K.
The maximum software UART baud rates available at TTL levels are 300-500K. TPU
I/O pins may be configured through software as either a UART Rx or Tx. The TPU
handles all timing and buffering of serial transmissions and therefore achieves a CPU
independence equivalent to a hardware UART.
Changing the Baud Rate
You can change the UART's baud rate by using the information in Table 6-8.
Table 6-8 is a table of clock rates for the 40 kHz crystal. The system clock can be set
up to run at any of the frequencies given below (depending the power requirements
and/or chip ratings of your particular system).
D-3285-C
Onset Computer Corporation - Model 8 with C
Page 6-15