Cirrus Logic AN130 - Manual (Page 10)

AN130
10 AN130REV2
MOVLW 0x05 ; Command to write CSRs
BCF PORTA, CS ; select the ADC
CALL send_byte ; send command byte to ADC
;*** Setup CSR #1 - Setups 1 and 2
;
setting both to default value of ’000’
; (A1-A0 = 00, Physical Channel = 1, OWR = 15Hz,
; input V-range = 100mV, Bipolar Measurement mode) ***
MOVLW 0x00 ; all zeros
CALL send_byte ; send first byte
CALL send_byte ; send second byte
CALL send_byte ; send third byte
;*** Setup CSR #2 - Setups 3 and 4
;
setting Setup 3 to ’4C0’ and Setup 4 to ’105’
; Setup 3 Settings - (A1-A0 = 01, Physical Channel = 2,
; OWR = 101.1 Hz, input V-range = 100mV, Bipolar)
; Setup 4 Settings - (A1-A0 = 00, Physical Channel = 3,
; OWR = 15 Hz, input V-range = 25mV, Unipolar)
MOVLW 0x4C ; first byte of info
CALL send_byte ; send first byte
MOVLW 0x01 ; second byte of info
CALL send_byte ; send second byte
MOVLW 0x05 ; third byte of info
CALL send_byte ; send last byte
BSF PORTA, CS ; de-select the ADC
RETURN ; exit
;*****************************************************************************