W83877ATF Datasheet, PDF (13/191 Pages) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

W83877ATF
1.2 Serial Port Interface, continued
SYMBOL PIN
I/O
RTSB
45
I/O_8tc
PGOIQSEL
IN_t
IRTX2
IRRX2
95
OUT_12t
94
IN_t
FUNCTION
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 4.7 kΩ is recommended when
intending to pull up at power-on reset.
Function as a InfraRed transmission data line.
Function as a InfraRed receiving line.
1.3 Multi-Mode Parallel Port
The following pins have eight functions, which are controlled by bits PRTMOD0, PRTMOD1, and
PRTMOD2 of CR0 and CR9 (refer to section 8.0, Extended Functions).
SYMBOL PIN
I/O
FUNCTION
BUSY
24
IN_t PRINTER MODE: BUSY
An active high input indicates that the printer is not ready to
receive data. This pin is pulled high internally. Refer to the
description of the parallel port for the definition of this pin in ECP
and EPP mode.
OD_{12 EXTENSION FDD MODE: MOB2}
This pin is for Extension FDD B; the function of this pin is the
same as that of the MOB pin.
OD_{12 EXTENSION 2FDD MODE: MOB2}
This pin is for Extension FDD A and B; the function of this pin is
the same as that of the MOB pin.
ACK
26
IN_{t PRINTER MODE: ACK}
An active low input on this pin indicates that the printer has
received data and is ready to accept more data. This pin is
pulled high internally. Refer to the description of the parallel port
for the definition of this pin in ECP and EPP mode.
OD_{12 EXTENSION FDD MODE: DSB2}
This pin is for the Extension FDD B; its functions are the same
as those of the DSB pin.
OD_{12 EXTENSION 2FDD MODE: DSB2}
This pin is for Extension FDD A and B; the function of this pin is
the same as that of the DSB pin.
Publication Release Date: April 1998
-9-
Version 0.51