W83977F Datasheet, PDF (28/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
PRELIMINARY
1.6 FDC Interface, continued
SYMBOL PIN I/O
INDEX
17 IN_cs
FUNCTION
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 KΩ resistor, which
can be disabled by bit 7 of L0-CRF0 (FIPURDWN).
1.7 KBC Interface
SYMBOL PIN
KDATA
59
MDATA
60
KCLK
67
MCLK
68
GA20
56
GP11
(IRQIN2)
KBRST
57
GP12
(WDTO,
IRRX)
KBLOCK
58
GP13
(PLEDO,
IRTX)
I/O
I/OD_16u
I/OD_16u
I/OD_16u
I/OD_16u
OUT_12t
I/O_12t
OUT_12t
I/O_12t
IN_16tu
I/O_16tu
FUNCTION
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. It can be
configured as an interrupt channel.
CR2A bit7= 0 (default): Keyboard Reset (P20) Output.
CR2A bit7= 1: General purpose I/O port 1, bit 2. It can be
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. It can be
configured as watchdog timer output or IRTX (SOUTC if UART C
is used as a simple serial port [W83977AF only] ) output.
1.8 RTC Interface
SYMBOL PIN
VBAT
64
XTAL1
63
XTAL2
61
1.9 POWER PINS
I/O
FUNCTION
RTC battery voltage input
IN_C RTC 32.768Khz Clock Input
O_8t RTC 32.768Khz Clock Output
VCC
GND
20,55,
85,115
25,62,
90,120
+5V power supply for the digital circuitry
Ground
Publication Release Date: March 1998
-17 - Revision 0.58