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W83697SF

WINBOND I/O

Winbond 

W83697SF

1.4 Serial Port Interface

SYMBOL PIN

I/O

CTSA#

CTSB#

47

INt

55

DSRA#

DSRB#

48

INt

56

RTSA#

HEFRAS

49

O8

INcd

RTSB#

57

O8

DTRA#

50

O8

PNPCSV#

INcd

DTRB#

SINA

SINB

SOUTA

58

O8

51

INt

59

52

O8

PENROM#

INcd

SOUTB

PEN48

61

O8

INcd

DCDA#

DCDB#

RIA#

RIB#

53

INt

62

54

INt

63

FUNCTION

Clear To Send. It is the modem control input.

The function of these pins can be tested by reading bit 4 of the

handshake status register.

Data Set Ready. An active low signal indicates the modem or data

set is ready to establish a communication link and transfer data to

the UART.

UART A Request To Send. An active low signal informs the modem

or data set that the controller is ready to send data.

During power-on reset, this pin is pulled down internally and is

defined as HEFRAS, which provides the power-on value for CR26 bit

6 (HEFRAS). A 4.7 kΩ is recommended if intends to pull up.

(select 4EH as configuration I/O port′s address)

UART B Request To Send. An active low signal informs the modem

or data set that the controller is ready to send data.

UART A Data Terminal Ready. An active low signal informs the

modem or data set that the controller is ready to communicate.

During power-on reset, this pin is pulled down internally and is

defined as PNPCSV#, which provides the power-on value for CR24

bit 0 (PNPCSV#). A 4.7 kΩ is recommended if intends to pull up.

(clear the default value of FDC, UARTs, and PRT)

UART B Data Terminal Ready. An active low signal informs the

modem or data set that controller is ready to communicate.

Serial Input. It is used to receive serial data through the

communication link.

UART A Serial Output. It is used to transmit serial data out to the

communication link.

During power on reset , this pin is pulled down internally and is

defined as PENROM#, which provides the power on value for CR24

bit 1. A 4.7kΩ is recommended if intends to pull up .

UART B Serial Output. During power-on reset, this pin is pulled

down internally and is defined as PEN48, which provides the power-

on value for CR24 bit 6 (EN48). A 4.7 kΩ resistor is recommended

if intends to pull up.

Data Carrier Detect. An active low signal indicates the modem or

data set has detected a data carrier.

Ring Indicator. An active low signal indicates that a ring signal is

being received from the modem or data set.

- 16 -

Publication Release Date: Dec 2002

Revision 1.0

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