[Help] Assembly program for 8052 (ADC serial in)

johnsmith123 said:

what are the components you are using?
Do you have any datasheets?

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Nigel Goodwin said:

Presumably yet another homework/classwork question? - and we can guess what part of the world it's from as it's using long out of date components!.

Actually it's not from the usual place, but not too far away!.

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AD_CS BIT P1.0 ;CS, CK and DO fitted to port 1
AD_CK BIT P1.1
AD_DO BIT P1.2
AD_RESULT equ 030h; ;This variable holds result from A/D conversion.
;
MOV P1, 0FFh
CLR AD_CK
CLR AD_CS ;Select chip (initiate conversion)
;
MOV R1, #02h
;
PREPARE: SETB AD_CK ;MUX settling time
ACALL delay_us
CLR AD_CK
ACALL delay_us
DJNZ R1, PREPARE

MOV R2,AD_RESULT
MOV R1, #08h ;Read in value from A/D convertor, 8 BITS
CONVERSION: SETB AD_CK
ACALL delay_us
MOV C, AD_DO
MOV A, R2
RLC A ;Left because MSB comes in first
MOV R2, A
CLR AD_CK
ACALL delay_us
DJNZ R1, CONVERSION
MOV AD_RESULT, R2

SETB AD_CK ;cycle clock once.
ACALL delay_us;
CLR AD_CK
ACALL delay_us;

SETB AD_CS ;Deselect chip.

delay_us: ;FOR STANDARD 12 CYCLE and 11.0592 MHz
MOV R3, #05h ;10 uS
DJNZ R3, $
RET

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