SN8P2740 Series
ADC, OP-amp, Comparator 8-Bit Micro-Controller
6.9 ADC INTERRUPT OPERATION
When the ADC converting successfully, the ADCIRQ will be set to “1” no matter the ADCIEN is enable or disable. If the
ADCIEN and the trigger event ADCIRQ is set to be “1”. As the result, the system will execute the interrupt vector. If
the ADCIEN = 0, the trigger event ADCIRQ is still set to be “1”. Moreover, the system won‟t execute interrupt vector
even when the ADCIEN is set to be “1”. Users need to be cautious with the operation under multi-interrupt situation.
Example: ADC interrupt request setup.
B0BCLR
FADCIEN
; Disable ADC interrupt service
MOV
B0MOV
MOV
A, #10110000B
ADM, A
A, #00000000B
ADR, A
;
; Enable P4.0 ADC input and ADC function.
; Set ADC converting rate = Fcpu/16
B0MOV
B0BSET
B0BCLR
B0BSET
FADCIEN
FADCIRQ
FGIE
; Enable ADC interrupt service
; Clear ADC interrupt request flag
; Enable GIE
B0BSET
FADS
; Start ADC transformation
Example: ADC interrupt service routine.
ORG
JMP
8
; Interrupt vector
INT_SERVICE
INT_SERVICE:
…
; Push routine to save ACC and PFLAG to buffers.
B0BTS1
JMP
FADCIRQ
EXIT_INT
; Check ADCIRQ
; ADCIRQ = 0, exit interrupt vector
B0BCLR
FADCIRQ
; Reset ADCIRQ
…
; ADC interrupt service routine
…
EXIT_INT:
…
; Pop routine to load ACC and PFLAG from buffers.
; Exit interrupt vector
RETI
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