W83627HF/F
PRELIMINARY
Publication Release Date: November 2000
- 15 - Revision 1.0
1.4 Serial Port Interface
SYMBOL
PIN
I/O
FUNCTION
CTSA#
CTSB#
49
78
IN
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.
DSRA#
DSRB#
50
79
IN
t
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.
RTSA#
51
I/O
8t
UART A Request To Send. An active low signal informs the modem
or data set that the controller is ready to send data.
HEFRAS
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
Ω
is recommended if intends to pull up.
(select 4EH as configuration I/O port
′
s address)
RTSB#
80
I/O
8t
UART B Request To Send. An active low signal informs the modem
or data set that the controller is ready to send data.
DTRA#
PNPCSV#
52
I/O
8t
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
Ω
is recommended if intends to pull up.
(clear the default value of FDC, UARTs, PRT, Game port and MIDI
port)
DTRB#
81
I/O
8t
UART B Data Terminal Ready. An active low signal informs the
modem or data set that controller is ready to communicate.
SINA
SINB
53
82
IN
t
Serial Input. It is used to receive serial data through the
communication link.
SOUTA
54
I/O
8t
UART A Serial Output. It is used to transmit serial data out to the
communication link.
PENKBC
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)
SOUTB
PEN48
83
I/O
8t
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
Ω
resistor is
recommended if intends to pull up.
DCDA#
DCDB#
56
84
IN
t
Data Carrier Detect. An active low signal indicates the modem or
data set has detected a data carrier.
RIA#
RIB#
57
85
IN
t
Ring Indicator. An active low signal indicates that a ring signal is
being received from the modem or data set.
Содержание W83627F
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