W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 18

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

Serial Port Interface, continued.
4.4
SOUTA
PENKRC
SOUTB
DCDA
DCDB
IRRX (SINC)
IRTX
(SOUTC)
IRRXH
IRSL0
GP25 (GA20)
CIRRX
GP24 (P16)
P13
RIA
RIB
CTSC
SYMBOL
SYMBOL
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
Infrared Interface
PIN
PIN
53
47
54
65
66
46
37
38
39
40
OUT 12t
OUT 12t
I/O 12t
I/O 12t
I/O 12t
I/O 12t
I/O 8t
I/O
IN cs
I/O
IN
IN
I/O
IN t
IN t
8t
t
t
UART A Serial Output.
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 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.
Infrared Receiver input.
configured as a simple serial port. [W83977AF only]
Infrared Transmitter Output. It functions as SOUT output if 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:
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
-10
CTS
input of UART C. [W83977AF only]
It functions as SIN input if UART C is
Used to transmit serial data out to the
FUNCTION
FUNCTION