W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 28

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

1.6 FDC Interface, continued
1.7 KBC Interface
1.8 RTC Interface
1.9 POWER PINS
KDATA
MDATA
KCLK
MCLK
GA20
GP11
(IRQIN2)
KBRST
GP12
(WDTO,
IRRX)
KBLOCK
GP13
(PLEDO,
IRTX)
VBAT
XTAL1
XTAL2
VCC
GND
INDEX
SYMBOL
SYMBOL
SYMBOL
PIN
59
60
67
68
56
57
58
20,55,
85,115
25,62,
90,120
17
PIN
PIN
64
63
61
IN
I/O
I/OD
I/OD
I/OD
I/OD
OUT
I/O
OUT
I/O
IN
I/O
cs
16tu
IN
O
+5V power supply for the digital circuitry
Ground
I/O
I/O
12t
12t
16tu
8t
16u
16u
16u
16u
C
12t
12t
This Schmitt-triggered input from the disk drive is active low when the
head is positioned over the beginning of a track marked by an index
hole. This input pin is pulled up internally by a 1 K
can be disabled by bit 7 of L0-CRF0 (FIPURDWN).
Keyboard Data
PS2 Mouse Data
Keyboard Clock
PS2 Mouse Clock
CR2A bit6= 0 (default): Keyboard GATE A20 (P21) Output.
CR2A bit6= 1: General purpose I/O port 1, bit 1.
configured as an interrupt channel.
CR2A bit7= 0 (default): Keyboard Reset (P20) Output.
CR2A bit7= 1: General purpose I/O port 1, bit 2.
configured as watchdog timer output or IRRX (SINC if UART C is
used as a simple serial port [W83977AF only] ) input.
CR2B bit0= 0 (default): Keyboard KINH (P17) Input.
CR2B bit0= 1: General purpose I/O port 1, bit 3.
configured as watchdog timer output or IRTX (SOUTC if UART C
is used as a simple serial port [W83977AF only] ) output.
RTC battery voltage input
RTC 32.768Khz Clock Input
RTC 32.768Khz Clock Output
W83977F/ W83977AF
FUNCTION
FUNCTION
FUNCTION
Publication Release Date: March 1998
PRELIMINARY
-17 -
resistor, which
Revision 0.58
It can be
It can be
It can be