W83877ATF Datasheet, PDF(12/191 Page) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

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W83877ATF Datasheet, PDF (12/191 Pages) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

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W83877ATF

1.2 Serial Port Interface, continued

SYMBOL PIN

I/O

RIB

INt

A15

INt

SINA

INt

SINB

INt

IRRX1

SOUTA

INt

I/O8tc

PEN16SA

INt

SOUTB

IRTX1

DTRA

PHEFRAS

I/O12t

INt

I/O8tc

INt

DTRB

I/O8t

RTSA

I/O8tc

PPNPCVS

INt

FUNCTION

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

received by the modem or data set.

System address bus bit 15, when 16-bit address decoder is

selected.

Serial Input of COM A. Used to receive serial data from the

communication link.

Serial Input of COM B. Used to receive serial data from the

communication link.

When infrared function is selected, acts as infrared input.

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 PEN16SA, which provides the power-on value for

CR2E.bit6 ( PEN16SA ). A 4.7 kâ¦ is recommended when

intending to pull down at power-on reset.

UART B Serial Output. Used to transmit serial data out to the

communication link.

Infrared serial data output when COM B acts as infrared port.

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), and Configuration Port is defined at 250h.

A 4.7 kâ¦ is recommended when intending to pull up at power-on

reset, and Configuration Port is defined at 3F0h.

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 4.7 kâ¦ is recommended when

intending to pull down at power-on reset.

Publication Release Date: April 1998

-8-

Version 0.51

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