F1

CSEG AT 0000H
LJMP 0030H

CSEG AT 000BH
LJMP ISR_TIMER0_OVF

CSEG AT 0030H
MOV P1, #0
MOV SP,#2FH
MOV R6,#215
LCALL TIM_INIT

END_OF_PROGRAM:
LJMP END_OF_PROGRAM

TIM_INIT:
ANL TMOD ,#0F0H
ORL TMOD ,#02H
MOV TH0 ,#106
SETB TR0
SETB ET0
SETB EA
RET

ISR_TIMER0_OVF:
DJNZ R6,ISREND
MOV R6,#215
PUSH ACC
MOV A,P1
INC A
MOV P1,A
POP ACC
ISREND:
RETI

END