5_5.txt

This are the Laboratory programs for the 89c51

;TIMER IN MOD 3
ORG 0000H
AJMP STRT
ORG 000BH
AJMP T0_ISR
ORG 001BH
AJMP T1_ISR
ORG 0100H
STRT:
MOV TMOD, #33H
MOV TH0,#06D
MOV TL0,#38H
MOV TL1,#00H
MOV TH1,#00H
MOV IE,#8AH
SETB TR0
SETB TR1
MOV TMOD ,#13H
LOOP:
MOV R0,TL1
MOV R1, TH1
CJNE R0,#20H,CHKL
CHKL:
JC AHEAD
CJNE R1,#4EH,CHKH
CHKH:
JC AHEAD
MOV TH1,#00H
MOV TL1,#00H
CPL P1.2
AHEAD:
SJMP LOOP
T0_ISR:
CLR TR0
CPL P1.0
MOV TL0,#06D
SETB TR0
RETI
T1_ISR:
CLR TR1
CPL P1.1
MOV TH0,#56D
SETB TR1
RETI
END