W83977EG-AW Datasheet, PDF (13/142 Pages) Nuvotem Talema – These products are not designed for use in life support appliances

W83977EF-AW/W83977EG-AW
4.2 General Purpose I/O Port
SYMBOL
PIN
I/O
FUNCTION
PWR_CTL# 69 OD_16u Power supply control
GP20
(KBRST)
General purpose I/O port 2 bit 0.
I/O_{16tu Alternate Function from GP20: Keyboard reset (KBC P20)}
SMI #
For the power management, the SMI is active low by the power
70
OD_{12t management events, that generate and SCI in ACPI mode.}
(CR2B bit 4_3 = 00, default)
GP21
(P13)
I/O_12t General purpose I/O port 2 bit 1. (CR2B bit 4_3 = 01)
Alternate Function from GP21: KBC P13 I/O port.
P16
I/O_12t KBC P16 I/O port. (CR2B bit 4_3 = 10)
PANSWOT#
72
OD_12t Panel Switch output. (CR2B bit 5 = 0, default)
GP22
I/O_12t General purpose I/O port 2 bit 2. (CR2B bit 5 = 1)
(P14)
Alternate Function from GP22: KBC P14 I/O port.
PANSWIN#
73
IN_t Panel Switch input. (CR2B bit 7_6 = 00, default)
GP23
I/O_12t General purpose I/O port 2 bit 3. (CR2B bit 7_6 = 01)
(P15)
Alternate Function from GP23: KBC P15 I/O port
SUSC#
(GA20)
Suspend C input
39
IN_ts
Alternate Function from GP25: GATE A20 (KBC P21)
GP25
I/O₁₂ General purpose I/O port 2 bit 5.
4.3 Serial Port Interface
SYMBOL PIN
I/O
CTSA#
CTSB#
41
48
IN_t
DSRA#
DSRB#
RTSA#
42
49
IN_t
43
I/O_8t
HEFRAS
FUNCTION
Clear To Send is the modem control input.
The function of these pins can be tested by reading Bit 4 of the
handshake status register.
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.
UART A Request To Send. An active low signal informs the
modem or data set that the controller is ready to send data.
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 kΩ is recommended if intends to
pull up. (select 370H as configuration I/O port′s address)
Publication Release Date: Apr. 2006
-11-
Revision 1.2