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W83787IF

WINBOND I/O WITH SERIAL-INFRARED SUPPORT

Winbond 

W83787IF

1.2 Serial Port Interface

SYMBOL PIN I/O

FUNCTION

CTSA

CTSB

34 I Clear To Send is the modem control input.

47

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

handshake status register.

DSRA

DSRB

33 I Data Set Ready. An active low indicates the modem or data set is ready

48

to establish a communication link and transfer data to the UART.

DCDA

DCDB

32 I Data Carrier Detect. An active low indicates the modem or data set has

49

detected a data carrier.

RIA

RIB

SINA

SINB

IRRX1

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

50

received by the modem or data set.

30 I Serial Input. Used to receive serial data from the communication link.

42

SINB can be programmed by CR0D register as input pin IRRX1 for

serial infrared communication

SOUTA

HURAS1

38 I/O UART A Serial Output. Used to transmit serial data out to the

communication link.

During power-on reset, this pin is pulled up internally and is defined as

HURAS1, which is used for selecting the I/O address of the UART A.

(See Table 1-2.)

SOUTB

HURBS1

IRTX1

43 I/O UART B Serial Output. Used to transmit serial data out to the

communication link. SOUTB can be programmed by CR0D register as

output pin IRTX1 for serial infrared communication.

O

During power-on reset, this pin is pulled up internally and is defined as

HURBS1, which is used for selecting the I/O address of UARTB. (See

Table 1-2.)

DTRA

HPRTAS0

35 I/O UART A Data Terminal Ready. An active low 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 HPRTAS0. It is used for selecting the address of the parallel port.

(See Table 1-3.)

DTRB

HURAS0

46 I/O UART B Data Terminal Ready. An active low informs the modem or

data set that controller is ready to communicate.

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

as HURAS0. It is used for setting the I/O address of UART A. (See

Table 1-2.)

Publication Release Date:Sep 1995

-5-

Revision A1

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