13.

14.

IT8687R

4

Table 5-1. Signal Names (by pin numbers in alphabetical order) [cont’d]

Pin No.

Symbol

I/O

Description

22

SA13/LRTS2

IS

ISA I/O Address 13. The second function is Serial Port 2 RTS line driver

input.

23

SA12/LDTR2

IS

ISA I/O Address 12. The second function is Serial Port 2 DTR line driver

input.

24

RESET

IS

System reset, active high

27

DTR2

O16H

Serial port 2 DTR line driver output

28

RTS2

O16H

Serial port 2 RTS line driver output

29

TX2

O16H

Serial port 2 TX line driver output

32

RI2

ISH

Serial port 2 RI line receiver input

33

CTS2

ISH

Serial port 2 CTS line receiver input

34

DSR2

ISH

Serial port 2 DSR line receiver input

35

RX2

ISH

Serial port 2 RX line receiver input

36

RLSD2

ISH

Serial port 2 RLSD line receiver input

37

RI1

ISH

Serial port 1 RI line receiver input

38

CTS1

ISH

Serial port 1 CTS line receiver input

39

DSR1

ISH

Serial port 1 DSR line receiver input

40

RX1

ISH

Serial port 1 RX line receiver input

41

RLSD1

ISH

Serial port 1 RLSD line receiver input

44

DTR1

O16H

Serial port 1 DTR line driver output

45

RTS1

O16H

Serial port 1 RTS line driver output

46

TX1

O16H

Serial port 1 TX line driver output

48

MODE

IS

Primary function is selected when this pin is low; secondary function is

selected when it is high.

25,31

42

NC

No Connection

6,19

GND

Ground

13

VCC

+5V power

30,43

VSS

-12V power

26,47

VDD

+12V power