Programa de ensamblaje del microcontrolador 51
ORG 0000H
LJMP PRINCIPAL
ORG 000BH
LJMP T0ISR
ORG 0030H
PRINCIPAL:
MOV TMOD, #51H
MOV TH0, #ALTO(65536-50000)
MOV TL0, #BAJO(65536-50000)
MOV TH1, #0
MOV TL1, #0
SETB TR0
SETB TR1
SETB ET0
SETB EA
CLR A
MOV R2, #0
BUCLE:
SJMP $
T0ISR:
CLR TR0
MOV TH0, #ALTO(65536-50000)
MOV TL0, #BAJO(65536-50000 )
SETB TR0
INC A
CJNE A,#20,T0E
MOV A,#0
INC R2
CJNE R2, #10, T0E
MOV R2, #0
MOV R1, TH1
MOV R0 , TL1
MOV B, #10
LCALL DIV16
MOV P1, R0
T0E:
RETI
; R1: R0/B=R1: R0
DIV16:
MOV R7, #08H
MOV B, # 6
DIV1:
CLR C
MOV A, R0
RLC A
MOV R0, A
MOV A, R1
RLC A
MOV R1, A
CLR C
SUBB A, B
JC DIV2
MOV R1, A
INC R7
DIV2:
DJNZ R7, DIV1
RET
FIN