4_1.txt

This are the Laboratory programs for the 89c51

;TO GENERATE 1KHZ ON P1.0 OF D=50%
ORG 0000H
SETB P1.0
MOV TMOD,#10H
BACK:MOV TL1,#0CH
MOV TH1,#0FEH
SETB TR1
XXX: JNB TF1 ,XXX
CLR TR1
CLR TF1
CPL P1.0
SJMP BACK		
END