W83877F View Datasheet(PDF) - Winbond

Part Name

Description

MFG CO.

W83877F

WINBOND I/O

Winbond 

W83877F

1.2 Serial Port Interface, continued

SYMBOL PIN

I/O

SOUTB/

IRTX1/

43

I/O8t

PGMDRQ

DTRA

35

I/O8t

PHEFRAS

DTRB

46

O8t

RTSA

36

I/O8t

PPNPCVS

RTSB

45

I/O8t

PGOIQSEL

FUNCTION

UART B 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 PGMDRQ, which provides the power-on value for

CR16 bit 3 (GMDRQ). A 47 kΩ is recommended when intends

to pull down at power-on reset.

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 PHEFRAS, which provides the power-on value for

CR16 bit 0 (HEFRAS). A 47 kΩ is recommended when intends

to pull up at power-on reset.

UART B Data Terminal Ready. An active low informs the

modem or data set that controller is ready to communicate.

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

data set that the controller is ready to send data.

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

defined as PPNPCVS, which provides the power-on value for

CR16 bit 2 (PNPCVS). A 47 kΩ is recommended when intends

to pull down at power-on reset.

UART B Request To Send. An active low 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 PGOIQSEL, which provides the power-on value for

CR16 bit 4 (GOIQSEL). A 47 kΩ is recommended when intends

to pull up at power-on reset.

Publication Release Date: January 1996

-7-

Revision A2

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