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[ADC 0808 interfacing with 8051] code ASM not run

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trungbeca

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sbd please tell me why it not run, i didn't receive data from ADC , ADC_data always high. thanks
convert:
setb eoc
clr ale
clr start
nop
setb ale
setb start
HERE12:
cpl clk
jb eoc,HERE12
setb oe
mov A,ADC_Data // no data moved to A
clr oe
ret
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