w83697 Winbond Electronics Corp America, w83697 Datasheet - Page 22

• Manufacturer Part Number: w83697
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

1.4 Serial Port Interface
CTSA#
CTSB#
DSRA#
DSRB#
RTSA#
HEFRAS
RTSB#
DTRA#
PNPCSV#
DTRB#
SINA
SINB
SOUTA
PENROM#
SOUTB
PEN48
DCDA#
DCDB#
RIA#
RIB#
SYMBOL
PIN
47
55
48
56
49
57
50
58
51
59
52
61
53
62
54
63
I/O
I/O
I/O
I/O
I/O
I/O
I/O
IN
IN
IN
IN
IN
t
t
8t
8t
8t
8t
t
8t
8t
t
t
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)
UART B Request To Send. An active low signal informs the modem
or data set that the controller is ready to send data.
UART A Data Terminal Ready. An active low signal 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 PNPCSV# , which provides the power-on value for CR24
bit 0 ( PNPCSV# ). A 4.7 k
(clear the default value of FDC, UARTs, and PRT)
UART B Data Terminal Ready. An active low signal informs the
modem or data set that controller is ready to communicate.
Serial Input. It is used to receive serial data through the
communication link.
UART A Serial Output. It is used to transmit serial data out to the
communication link.
During power on reset , this pin is pulled down internally and is
defined as PENROM#, which provides the power on value for CR24
bit 1. A 4.7k
UART B Serial Output. During power-on reset, this pin is pulled
down internally and is defined as PEN48, which provides the power-
on value for CR24 bit 6 (EN48). A 4.7 k resistor is recommended
if intends to pull up.
Data Carrier Detect. An active low signal indicates the modem or
data set has detected a data carrier.
Ring Indicator. An active low signal indicates that a ring signal is
being received from the modem or data set.
is recommended if intends to pull up .
- 13 -
is recommended if intends to pull up.
FUNCTION
is recommended if intends to pull up.
Publication Release Date:Feb. 2002
W83697HF
Revision 0.70