第1个回答 2013-07-08
ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 001BH
LJMP T1ISR
ORG 0030H
MAIN:
MOV TMOD,#11H
MOV TH0,#HIGH(65536-800)
MOV TL0,#LOW(65536-800)
MOV TH1,#HIGH(65536-50000)
MOV TL1,#LOW(65536-50000)
SETB TR0
SETB TR1
SETB ET0
SETB ET1
SETB EA
CLR 00H
MOV R2,#0
SJMP $
T0ISR:
CLR TR0
MOV TH0,#HIGH(65536-800)
MOV TL0,#LOW(65536-800)
SETB TR0
CPL P.13
RETI
T1ISR:
CLR TR1
MOV TH1,#HIGH(65536-50000)
MOV TL1,#LOW(65536-50000)
SETB TR1
INC R2
JB 00H,T1STOP
MOV A,R2
CJNE A,#22,T101
T101:
JC T1RE
MOV R2,#0
CPL 00H
CLR TR0
RETI
T1STOP:
MOV A,R2
CJNE A,#20,T102
T102:
JC T1RE
MOV R2,#0
CPL 00H
SETB TR0
T1RE:
RETI
END