?? watchdog.a51
字號:
$INCLUDE (reg_c51.INC)
org 000h
ljmp begin
;/**
; * FUNCTION_PURPOSE:this function setup Watchdog.
; * FUNCTION_INPUTS:void
; * FUNCTION_OUTPUTS:void
; */
org 0100h
begin:
;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;
loop: /* end less */
;/***********************************************
;* PROGRAM *
;************************************************/
; /* watchdog reset sequence */
MOV WDTRST,#1Eh;
MOV WDTRST,#0E1h;
JMP loop
END
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