long555 发表于 2006-8-17 11:04:00

TM1 EQU 5
TM2 EQU 10
ORG 0000H;
AJMP START
ORG 000BH;
AJMP TIME0;
ORG 30H;
START: MOV P1,#0FFH;
MOV R7,#00H;
MOV R6,#00H;
MOV TMOD,#00000001B;定时器0开启
MOV TH0,#3CH;定时50MS
MOV TL0,#0B0H;
SETB EA ;开启中断
SETB ET0;使能定时/计数中断0
SETB TR0;开启定时0
LOOP: AJMP LOOP
TIME0:
INC R7;
INC R6;
MOV A,R7;
CJNE A,#TM1,T_NEXT;定时250MS
T_L1: CPL P1.0
MOV R7,#0;
T_NEXT:MOV A,R6
CJNE A,#TM2,T_RET;
T_L2: CPL P1.1
MOV R6,#0;
T_RET:MOV TH0,#3CH;
MOV TL0,#0B0H;
RETI
END