Samsung S3F84B8 - Page 258

S3F84B8_UM_REV 1.00 13 A/D CONVERTER
13-6
Example 13-1 Configuring A/D Converter
;-----------------<< Interrupt Vector Address >>
VECTOR F0H, INT_ADC ;
;--------------<< Smart Option >>
ORG 003CH
DB 0FFH ; 003CH, must be initialized to 1
DB 0FFH ; 003DH, must be initialized to 1
DB 0FFH ; 003EH, must be initialized to 1
DB 0FFH ; 003FH, disables LVR and internal RC oscillator
ORG 0100H
RESET: DI ; Disables interrupt
LD BTCON,#10100011B ; Disables Watchdog
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LD P2CONH,#11111111B ; Configures P2.4–P2.7 AD input
LD P2CONL,#11111111B ; Configures P2.0–P2.3 AD input
EI ; Enables interrupt
;--------------<< Main loop >>
MAIN: 
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JR t, MAIN
AD_CONV: LD ADCON, #00110001B ; Selects analog input channel  P2.1
; Enables ADC interrupt
; Selects conversion speed  f
OSC
/8
; Sets conversion start bit
NOP
; If you set conversion speed to f
OSC
/8
; at least one NOP must be included
INT_ADC:
LD R2, ADDATAH ;
LD R3, ADDATAL ;
AND ADCON, #11110111B ; Clears pending bit
 ;
IRET ;
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END