w83627sf Winbond Electronics Corp America, w83627sf Datasheet - Page 20

• Manufacturer Part Number: w83627sf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

1.4
1.3 Multi-Mode Parallel Port, continued
AFD#
STB#
CTSA#
CTSB#
DSRA#
DSRB#
RTSA#
HEFRAS
SYMBOL
SYMBOL
Serial Port Interface
PIN
PIN
49
78
50
79
51
46
47
I/O
OD
OD
OD
OD
I/O
IN
IN
I/O
-
-
t
t
8t
12
12
12
12
Clear To Send. It 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 k
(select 4EH as configuration I/O port s address)
PRINTER MODE: AFD#
An active low output from this pin causes the printer to auto feed a
line after a line is printed. Refer to the description of the parallel
port for the definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: DRVDEN0
This pin is for Extension FDD B; its function is the same as the
DRVDEN0 pin of FDC.
EXTENSION 2FDD MODE: DRVDEN0
This pin is for Extension FDD A and B; its function is the same as
the DRVDEN0 pin of FDC.
PRINTER MODE: STB#
An active low output is used to latch the parallel data into the
printer. Refer to the description of the parallel port for the definition
of this pin in ECP and EPP mode.
EXTENSION FDD MODE: This pin is a tri-state output.
EXTENSION 2FDD MODE: This pin is a tri-state output.
- 13 -
is recommended if intends to pull up.
FUNCTION
FUNCTION
Publication Release Date: Nov. 2000
PRELIMINARY
W83627SF
Revision 0.60