A-2
WDT
MS-9A82
WDT Sample Code
SIO_INDEX_Port
equ 04Eh
SIO_DATA_Port
equ 04Fh
SIO_UnLock_Value
equ 087h
SIO_Lock_Value
equ 0AAh
WatchDog_LDN
equ 007h
WDT_UNIT
equ 60h
;
60h=second, 68h=minute, 40h=Disabled Watchdog timer
WDT_Timer
equ 30
;
ex. 30 seconds
Sample code:
;Enable config mode
mov
dx, SIO_INDEX_Port
mov
al, SIO_UnLock_Value
out
dx, al
jmp
short $+2
;Io_delay
jmp
short $+2
;Io_delay
out
dx, al
;Change to WDT
mov
dx, SIO_INDEX_Port
mov
al, 07h
out
dx, al
mov
dx, SIO_DATA_Port
mov
al, WatchDog_LDN
out
dx, al
;Acive WDT
mov
dx, SIO_INDEX_Port
mov
al, 30h
out
dx, al
mov
dx, SIO_DATA_Port
in
al, dx
or
al, 01h
out
dx, al
;set timer
mov
dx, SIO_INDEX_Port
mov
al, 0F6h
out
dx, al
mov
dx, SIO_DATA_Port
mov
al, WDT_Timer
out
dx, al
;set UINT
mov
dx, SIO_INDEX_Port
mov
al, 0F5h
out
dx, al
mov
dx, SIO_DATA_Port
mov
al, WDT_UNIT
out
dx, al
;enable reset
mov
dx, SIO_INDEX_Port
mov
al, 0FAh
out
dx, al
mov
dx, SIO_DATA_Port
in
al, dx
or
al, 01h
out
dx, al
;close config mode
mov
dx, SIO_INDEX_Port
mov
al, SIO_Lock_Value
out
dx, al
Summary of Contents for MS-9A82
Page 1: ...i MS 9A82 Point of Sale System...
Page 8: ...1 2 Overview System Overview...
Page 11: ...1 5 MS 9A82 h h Front View 1 2 h h Rear View 2 3...
Page 28: ...2 14 Getting Started Powering on the System Press the power button to power on the system...
Page 48: ......
Page 49: ...2 A 1 This appendix provides the sample codes of WDT Watch Dog Timer Appendix WDT...