w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 142

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

CRF0 (Default 0x00)
11.6 Logical Device 5 (KBC)
CR30 (Default 0x01
CR60, CR 61 (Default 0x00, 0x60
CR62, CR 63 (Default 0x00, 0x64
CR70 (Default 0x01
CR72 (Default 0x0C
CRF0 (Default 0x83)
Bit 7 - 2: Reserved.
Bit 1 - 0: SUBCLKB1, SUBCLKB0
Bit 7 - 1: Reserved.
Bit 0:
These two registers select the first KBC I/O base address [0x100:0xFFF] on 1 byte boundary.
These two registers select the second KBC I/O base address [0x100:0xFFF] on 1 byte boundary.
Bit 7 - 4: Reserved.
Bit [3:0]: These bits select IRQ resource for KINT (keyboard).
Bit 7 - 4: Reserved.
Bit [3:0]: These bits select IRQ resource for MINT (PS2 Mouse)
Bit 7 - 6: KBC clock rate selection
Bit 5 - 3: Reserved.
Bit 2: = 0 Port 92 disable.
= 00
= 01
= 10
= 11
= 1 Activates the logical device.
= 0 Logical device is inactive.
= 00 Select 6MHz as KBC clock input.
= 01 Select 8MHz as KBC clock input.
= 10 Select 12Mhz as KBC clock input.
= 11 Select 16Mhz as KBC clock input.
= 1 Port 92 enable.
UART B clock source is 1.8462 Mhz (24MHz/13)
UART B clock source is 2 Mhz (24MHz/12)
UART B clock source is 24 Mhz (24MHz/1)
UART B clock source is 14.769 Mhz (24MHz/1.625)
if PENKBC= 1 during POR, default 0x00 otherwise)
if PENKBC= 1 during POR, default 0x00 otherwise)
if PENKBC= 1 during POR, default 0x00 otherwise)
if PENKBC= 1 during POR, default 0x00 otherwise)
if PENKBC= 1 during POR, default 0x00 otherwise)
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Publication Release Date:April 1998
W83977ATF
PRELIMINARY
Revision 0.52