W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 21

• Manufacturer Part Number: W83977AF
• Description: W83877TF Plus Kbc, Cir, RTC
• Manufacturer: Information Storage Devices, Inc

1.3 Serial Port Interface, continued
1.4 Infrared Interface
ENCPNP
IRRX (SINC)
IRTX
(SOUTC)
IRRXH
IRSL0
GP25
(GA20)
CIRRX
GP24 (P16)
P13
SINA
SINB
SOUTA
PENKRC
SOUTB
DCDA
DCDB
RIA
RIB
DTRB
CTSC
SYMBOL
SYMBOL
PIN
PIN
45,
51
52
46
53
47
54
65
66
37
38
39
40
OUT
OUT
I/O
I/O
I/O
I/O
I/O
I/O
I/O
IN
I/O
I/O
IN
IN
IN
IN
IN
cs
12t
12t
12t
12t
8t
t
8t
8t
t
t
t
t
12t
12t
UART B Data Terminal Ready. An active low signal informs the
modem or data set that controller is ready to communicate.
During power-on reset, this pin is pulled down internally and is
defined as ENCPNP, which provides the power-on value for
CR24 bit 1 (ENPNP). A 4.7 k
pull up. (enable comply PnP mode)
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 PENKRC, which provides the power-on value for
CR24 bit 2 (ENKBRTC). A 4.7 k
pull up. (enable KBC and RTC)
UART B Serial Output. Used to transmit serial data out to the
communication link.
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. It functions as SIN input if UART C is
configured as a simple serial port. [W83977AF only]
Infrared Transmitter Output.
UART C is configured as a simple serial port. [W83977AF only]
CR2A bit3, 2=00 (default): High speed IR receiving terminal.
CR2A bit3, 2=01: IR module select 0.
CR2A bit3, 2=10: General purpose I/O port 2, bit 5. It can be
configured as GATE A20 (Keyboard P21).
CR2A bit3, 2=11: CTS input of UART C. [W83977AF only]
CR2A bit5, 4=00 (default): Consumer IR receiving terminal.
CR2A bit5, 4=01: General purpose I/O port 2, bit 4. It can be
configured as Keyboard P16 I/O port.
CR2A bit5, 4=10: Keyboard P13 I/O
W83977F/ W83977AF
FUNCTION
FUNCTION
Publication Release Date: March 1998
It functions as SOUT output if
is recommended if intends to
is recommended if intends to
-10-
PRELIMINARY
Revision 0.58