Samsung S3C9454B User Manual page 172

S3C9454B/F9454B
F
PROGRAMMING TIP – Configuring A/D Converter (Continued)
CONV_LOOP: TM
JR
LD
LD
LD
CONV_LOOP2:TM
JR
LD
LD
•
•
•
RET
•
INT_9454:
•
•
IRET
•
•
END
ADCON,#00001000B
Z,CONV_LOOP
R0,ADDATAH
R1,ADDATAL
ADCON,#00010011B
ADCON,#00001000B
Z,CONV_LOOP2
R2,ADDATAH
R3,ADDATAL
; Check EOC flag
; If EOC flag=0, jump to CONV_LOOP until EOC flag=1
; High 8 bits of conversion result are stored
; to ADDATAH register
; Low 2 bits of conversion result are stored
; to ADDATAL register
; Select analog input channel → P0.1
; Select conversion speed → f
; Set conversion start bit
; Check EOC flag
;
; Interrupt enable bit and pending bit check
;
; Pending bit clear
;
A/D CONVERTER
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OSC
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