
W83977F/ W83977AF
PRELIMINARY
Publication Release Date: March 1998
-8-
Revision 0.58
1.1 Host Interface, continued
SYMBOL
PIN
I/O
FUNCTION
IRQ14
GP14
(GPACS)
PLED
IRSL1
IRQ15
GP15
(GPAWE)
WDT
IRSL2
CLKIN
103
OUT
12t
I/O
12t
OUT
12t
OUT
12t
OUT
12t
I/O
12t
CR2C bit1, 0= 00 (default): Interrupt request 14
CR2C bit1, 0= 01: General purpose I/O port 1, bit 4. It can be
configured as a general purpose address decode output.
CR2C bit1, 0= 10: Power LED output.
CR2C bit1, 0= 11: IR module select signal 1.
[W83977AF only]
104
OUT
12t
OUT
12t
IN
t
CR2C bit3, 2= 00 (default): Interrupt request 15
CR2C bit3, 2= 01: General purpose I/O port 1, bit 5. It can be
configured as a general purpose address write enable output.
CR2C bit3, 2= 10: Watch-Dog timer output.
CR2C bit3, 2= 11: IR module select signal 2.
[W83977AF only]
1
14.318/ 24 Mhz clock input, selectable through bit 5 of CR24.
1.2 Advanced Power Management
SYMBOL
PIN
I/O
FUNCTION
PHRI
GP20
(KBRST)
69
IN
t
I/O
12t
CR2B bit2, 1=00 (default): Advanced Power Management (APM)
phone ring indicator. Detection of an active PHRI pulse or pulse
train activates the PSCTL signal.
CR2B bit2, 1=01: General purpose I/O port 2, bit 0. It can be
configured as keyboard reset (Keyboard P20).
POFIRQ
GP21 (P13)
P16
RIC
70
OUT
12t
I/O
12t
I/O
12t
IN
t
CR2B bit4, 3=00 (default): Advanced Power Management (APM)
power off interrupt request.
CR2B bit4, 3=01: General purpose I/O port 2, bit 1. It can be
configured as Keyboard P13 I/O port.
CR2B bit4, 3=10: Keyboard P16 I/O port.
CR2B bit4, 3=11: RI input of UART C.
[W83977AF only]
VSB
71
-
Advanced Power Management (APM) standby current source
PSCTL
GP22 (P14)
72
OUT
12t
I/O
12t
CR2B bit5=0 (default): On/Off control for Advanced Power
Management (APM). This signal tells the main power supply
whether power should be turned on.
CR2B bit5=1: General purpose I/O port 2, bit 2. It can be
configured as Keyboard P14 I/O port.