system.asm

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.include hardware.inc

.code
.public _Delay
_Delay: .proc					//传入参数为1,延时2.5ms
	push r1,r5 to [sp]			//延时时间T = 2.5ms*n
	bp = sp+3
	
L_Loop1:
	r2 = r1
	r3 = 1
	r4 = 0x7012
	[r4] = r3
	call _ClearWatchdog   
L_Loop2:
	r2 -= 1
	jnz L_Loop2
	r1 -= 1
	jnz L_Loop1
	
	pop r1,r5 from [sp]
	retf
	.endp
	
.public _ClearWatchdog
_ClearWatchdog:.proc
	push r1 to [sp]
	r1 = 0x0001
	[0x7012] = r1
	pop r1 from [sp]
	retf
	.endp