W83977EF-AW(2003) View Datasheet(PDF) - Winbond

Part Name

Description

Manufacturer

W83977EF-AW
(Rev.:2003)

WINBOND I/O

Winbond 

W83977EF

1.2 General Purpose I/O Port ,continued

SYMBOL PIN

I/O

PANSWIN# 73

INt

GP23

I/O12t

(P15)

SUSC#

(GA20)

39

INts

GP25

I/O12

FUNCTION

Panel Switch input. (CR2B bit 7_6 = 00, default)

General purpose I/O port 2 bit 3. (CR2B bit 7_6 = 01)

Alternate Function from GP23: KBC P15 I/O port

Suspend C input

Alternate Function from GP25: GATE A20 (KBC P21)

General purpose I/O port 2 bit 5.

1.3 Serial Port Interface

SYMBOL PIN

I/O

CTSA#

CTSB#

41

INt

48

DSRA#

DSRB#

RTSA#

42

INt

49

43

I/O8t

HEFRAS

RTSB#

50

I/O8t

FUNCTION

Clear To Send 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 370H 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.

Publication Release Date: April 2003

-9 -

Revision 1.1

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