w83977eg Winbond Electronics Corp America, w83977eg Datasheet - Page 14

• Manufacturer Part Number: w83977eg
• Description: Winbond Isa I/o W83977ef W83977eg
• Manufacturer: Winbond Electronics Corp America

Serial Port Interface, continued
4.4
RTSB#
DTRA#
PNPCSV #
DTRB#
SINA
SINB
SOUTA
PENKBC
SOUTB
PEN48
DCDA#
DCDB#
RIA#
RIB#
IRRX
IRTX
SYMBOL
Infrared Interface
45, 52
PIN
50
44
51
46
53
47
54
65
66
37
38
OUT
I/O
I/O
I/O
I/O
I/O
IN
IN
IN
IN
I/O
cs
8t
8t
8t
8t
8t
t
t
t
12t
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 kΩ is recommended if intends to
pull up. (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. Used to receive serial data through the
communication link.
UART A Serial Output. Used to transmit serial data out to the
communication link.
During power-on reset, this pin is pulled down internally and is
defined as PENKBC, which provides the power-on value for
CR24 bit 2 (ENKBC). A 4.7 k Ω resistor is recommended if
intends to pull up. (enable KBC)
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 kΩ 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.
Infrared Receiver input.
Infrared Transmitter Output.
W83977EF-AW/W83977EG-AW
-12-
FUNCTION