?? wdt.asm
字號:
WDTRST EQU 0A6H
WDTPRG EQU 0A7H
ORG 0000H
LJMP MAIN
ORG 0100H
MAIN: ;Selected Time-out
;
;mode X1 12 clock periods per peripheral clock cycle.
;mode X2 6 clock periods per peripheral clock cycle.
;
;ORL WDTPRG,#00h (2^14 - 1) machine cycles, 16. 3 ms @ FOSCA =12 MHz
;ORL WDTPRG,#01h (2^15 - 1) machine cycles, 32.7 ms @ FOSCA=12 MHz
;ORL WDTPRG,#02h (2^16 - 1) machine cycles, 65. 5 ms @ FOSCA=12 MHz
;ORL WDTPRG,#03h (2^17 - 1) machine cycles, 131 ms @ FOSCA=12 MHz
;ORL WDTPRG,#04h (2^18 - 1) machine cycles, 262 ms @ FOSCA=12 MHz
;ORL WDTPRG,#05h (2^19 - 1) machine cycles, 542 ms @ FOSCA=12 MHz
;ORL WDTPRG,#06h (2^20 - 1) machine cycles, 1.05 s @ FOSCA=12 MHz
;ORL WDTPRG,#07h (2^21 - 1) machine cycles, 2.09 s @ FOSCA=12 MHz
;ORL WDTPRG,#07;/*2.275s @ FOSCA=11.059200 MHz */
;/* watchdog start sequence */
MOV WDTRST,#1Eh;
MOV WDTRST,#0E1h;
MOV P0,#00H
LCALL D500MS
MOV P0,#0FFH
LCALL D500MS
loop: MOV WDTRST,#1Eh;
MOV WDTRST,#0E1h;
SJMP loop
D20MS: MOV R6,#14H
D201: ACALL D1MS
DJNZ R6,D201
LCALL RSTWDT
RET
D1MS: MOV R7,#0C0H ;1T
DD1: NOP ;1T
NOP ;1T
NOP ;1T
DJNZ R7,DD1 ;2T
LCALL RSTWDT
RET ;2T
D250MS: MOV R5,#0CH
DD2: ACALL D20MS
DJNZ R5,DD2
RET
D500MS: MOV R5,#19H
DD3: ACALL D20MS
DJNZ R5,DD3
LCALL RSTWDT
RET
D400MS: MOV R5,#16H
DD4A: ACALL D20MS
DJNZ R5,DD3
LCALL RSTWDT
RET
D1S: MOV R5,#32H
DD4: ACALL D20MS
DJNZ R5,DD4
LCALL RSTWDT
RET
RSTWDT:
MOV WDTRST,#1Eh;
MOV WDTRST,#0E1h;
RET
D1M: MOV R6,#20H
D1MA: LCALL D1S
DJNZ R6,D1MA
RET
D2S: MOV R5,#64H
DD5: ACALL D20MS
DJNZ R5,DD5
LCALL RSTWDT
RET
;NOP
END
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