w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 19

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

1.3 Serial Port Interface, continued
1.4 Infrared Interface
DTRA#
PNPCSV#
DTRB#
IRRX
IRTX
SINA
SINB
SOUTA
PENKBC
SOUTB
PEN48
DCDA#
DCDB#
RIA#
RIB#
SYMBOL
SYMBOL
45, 52
PIN
44
51
46
53
47
54
65
66
PIN
37
38
OUT
I/O
I/O
I/O
I/O
IN
I/O
IN
IN
IN
I/O
cs
8t
8t
8t
8t
t
t
t
12t
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
pull up. (clears 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).
intending to pull up. (enables 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 k
recommended if intending 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.
-10 -
A 4.7 k
FUNCTION
FUNCTION
Publication Release Date: March 1999
is recommended if intending to
W83977EF/ CTF
resistor is recommended if
PRELIMINARY
resistor is
Revision A1