Appendix
Initial_Capture
movlw 0x41
movwf ADCON0
;before starting SPI transmission,
;aquire &convert ADC ch0, BUS_SENSE
;set:Fosc/8, A/D enable, ch0 select
;begin sampling ch0
movlw 0x04 ;wait for approx 20us aquisition time
movwf STARTUP_TIMER
delay
decf STARTUP_TIMER,F
btfss STATUS,Z
goto delay
bsf
ADCON0,GO
;Start A/D conversion Channel 0
finish_1st_conversion
btfsc ADCON0,GO ;wait for end of conversion flag
goto finish_1st_conversion
movf ADRES,W
movwf BYTE_TO_SEND
nop
;extra wait before starting new aquisi-
tion
;**************************************************************
Main
movlw 0x51
movwf ADCON0
;Fosc/8, A/D enabled, ch 2 selected
;begin sampling channel 2 |VAC|_SENSE
;begin to transmit value from channel 0
? 2003 Microchip Technology Inc.
bcf
bsf
btfsc
bsf
bcf
bcf
bsf
btfsc
bsf
bcf
bcf
bsf
btfsc
bsf
bcf
bcf
bsf
btfsc
bsf
bcf
GPIO,SDO ;send bit 7
GPIO,SCK
BYTE_TO_SEND,7
GPIO,SDO
GPIO,SCK
GPIO,SDO ;send bit 6
GPIO,SCK
BYTE_TO_SEND,6
GPIO,SDO
GPIO,SCK
GPIO,SDO ;send bit 5
GPIO,SCK
BYTE_TO_SEND,5
GPIO,SDO
GPIO,SCK
GPIO,SDO ;send bit 4
GPIO,SCK
BYTE_TO_SEND,4
GPIO,SDO
GPIO,SCK
DS70096A-page 49
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