A-4
WDT Programming
3)
Exit extended function mode.
MOV DX,3F0H
MOV AL,0AAH
OUT DX,AL
The Configuration Register (CR) Definition :
t
Chip (Global) Control Register (CCR): CR02 -->CR2F.
CR07 = Logical Device Number Register (LDNR)
t
Logical Device 0 (LD0) = FDC , with CR: CR30 -->CRF5 .
t
When LDNR (= CR07) = 00h , you can program the CR30 --CRF5 related to
FDC feature .
t
Logical Device 1 (LD1) = Parallel Port, with CR: CR30 -->CRF0.
t
LD2 = UART A (Serial Port 1) , with CR :CR30 -->CRF0.
t
LD3 = UART B (Serial Port 2) , with CR :CR30 -->CRF0.
t
LD5 = KBC, with CR: CR30 -->CRF0.
t
LD6 = IR , with CR: CR30 -->CRF0.
t
LD7 = GP I/O Port I, with CR: CR30 -->CRF1.
t
LD8 = GP I/O Port II, with CR: CR30 -->CRF4.
t
LD9 = GP I/O Port III, with CR: CR30 -->CRF1.
t
LDA = ACPI, with CR: CR30 -->CRFF.