W83977F-A Datasheet, PDF (18/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
Serial Port Interface, continued.
SYMBOL PIN
I/O
SOUTA
46
I/O8t
PENKRC
SOUTB
DCDA
DCDB
RIA
RIB
53
I/O_8t
47
IN_t
54
65
IN_t
66
UART A Serial Output.
communication link.
FUNCTION
Used to transmit serial data out to the
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 kΩ is recommended if intends to
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.
4.4 Infrared Interface
SYMBOL PIN
I/O
FUNCTION
IRRX (SINC)
37
INcs
Infrared Receiver input. It functions as SIN input if UART C is
configured as a simple serial port. [W83977AF only]
IRTX
(SOUTC)
38 OUT12t Infrared Transmitter Output. It functions as SOUT output if UART C is
configured as a simple serial port. [W83977AF only]
IRRXH
39
I/O12t CR2A bit3, 2=00 (default): High speed IR receiving terminal.
IRSL0
OUT12t ^{CR2A bit3, 2=01: IR module select 0.}
GP25 (GA20)
CTSC
I/O12t
INt
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]
CIRRX
GP24 (P16)
40
INt
CR2A bit5, 4=00 (default): Consumer IR receiving terminal.
I/O12t ^{CR2A bit5, 4=01: General purpose I/O port 2, bit 4. It can be configured}
as Keyboard P16 I/O port.
P13
CR2A bit5, 4=10: Keyboard P13 I/O
I/O12t
-10