
W83977TF
PRELIMINARY
Publication Release Date: March 1998
-107-
Revision 0.62
= 1 Gate20 hardware speed up.
Bit 0: = 0 KBRST software control.
= 1 KBRST hardware speed up.
Bit 1: = 0 Gate20 software control.
11.7 Logical Device 7 (GP I/O Port I)
CR30 (Default 0x00)
Bit 7 - 1: Reserved.
Bit 0: = 1 Activates the logical device.
= 0 Logical device is inactive.
CR60, CR 61 (Default 0x00, 0x00)
These two registers select GP1 I/O base address [0x100:0xFFF] on 1 byte boundary.
CR62, CR 63 (Default 0x00, 0x00)
These two registers select GP14 alternate function Primary I/O base address [0x100:0xFFE] on 2
byte boundary; They are available as you setting GP14 to be an alternate function (General
Purpose Address Decode).
CR64, CR 65 (Default 0x00, 0x00)
These two registers select GP15 alternate function Primary I/O base address [0x100:0xFFF] on 1
byte boundary; They are available as you setting GP15 to be an alternate function (General
Purpose Write Decode).
CR70 (Default 0x00)
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for GP10 as you setting GP10 to be an alternate function
(Interrupt Steering).
CR72 (Default 0x00)
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for GP11 as you setting
GP11
to be an alternate function
(Interrupt Steering).
CRE0 (GP10, Default 0x01)
Bit 7 - 5: Reserved.
Bit 4: IRQ Filter Select
= 1 Debounce Filter Enabled
= 0 Debounce Filter Bypassed
Bit 3: Select Function.
= 1 Select Alternate Function: Interrupt Steering.
= 0 Select Basic I/O Function.
Bit 2: Reserved.
Bit 1: Polarity.
= 1 Invert.
= 0 No Invert.