$mod51
mov a,#0aah
repeat: mov p1,a
cpl a
lcall delay
sjmp repeat
delay:mov r2,#0ffh
back:mov r1,#0ffh
up1:nop
nop
djnz r1,up1
djnz r2,back
ret
end
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DC motor control with Pulse Width Modulation Part 1
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