Assembly code for ADC 0808

Sample code for ADC 0808.
Following code can be using for 8051 and 8052 ICs like: 89c51, 89c52, 89s51, 89s52, 89c2051.

 

;=====================================================
;	Pin Definations
;=====================================================

data_bus		equ     90h             ; Port 0
adc_add_a		equ     b4h             ; P3.4
adc_add_b		equ     b3h             ; P3.3
adc_ale_soc		equ     b5h             ; P3.5
adc_eoc 		equ     b6h             ; P3.6
adc_oe  		equ     b7h             ; P3.7
;=====================================================
;	Main Program starts from here
;=====================================================
adctemp:	clr adc_add_a 		;Channel 0 is selected
		clr adc_add_b 		;Add b = 0, Add a = 0
		nop
		setb adc_ale_soc	;ale is made high
		nop
 		nop
		clr adc_ale_soc 	;soc is made low
		jb adc_eoc,$     	;check for eoc low
		jnb adc_eoc,$    	;check for eoc hing
		setb adc_oe      	;if eoc high,make oe high
		nop
		nop
		mov a,data_bus 	;Read Port0 data to Acc
		mov 40h,a       	;40h contains output data
		clr adc_oe 		;make oe low
		ret
;=====================================================
;      	Program ENDS here
;=====================================================
 

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