Question

用定时器T0定时，使P1.2口灯没个50ms闪烁 这个用51单片机汇编语言怎么编啊？

Answer 1

ORG 0000H
LJMP START
ORG 000BH
LJMP TIME0
START: MOV TMOD #01H
MOV IE,#082H
MOV TH0,#0FFH ;50MS
MOV TL0,#0F0H
SETB TR0
SJMP $
TIME0: MOV TH0,#0FFH ;50MS
MOV TL0,#0F0H
CPL P1.2
RETI
END

Answer 2

;
ORG 0000H
MOV TMOD, #01H
MOV IE, #82H
SETB TR0
XXX:
MOV TH0, #4CH
CPL P1.2
JB TF0, $
CLR TF0
JMP XXX
END

Answer 3

LED BIT P1.2;
ORG 0000H
LJMP START
ORG 000BH
LJMP Timer0Interrupt

START:
MOV SP,#60H
MOV R2,#50;50个1ms

LCALL InitTimer0

LOOP:
;add your code here!
LJMP LOOP

InitTimer0:
MOV TMOD,#00H;1ms
MOV TH0,#1CH
MOV TL0,#18H
SETB EA
SETB ET0
SETB TR0
RET

Timer0Interrupt:
PUSH DPH
PUSH DPL
PUSH ACC
MOV TH0,#1CH
MOV TL0,#18H
DJNZ R2,WD

MOV R2,#50

;========================
CPL LED ;add your code here!
;========================
WD:

POP ACC
POP DPL
POP DPH
RETI

END