adc_int.dt

台弯义隆芯片AD采样设计控制实例说明Application of ADC in EM。

;******************************************************************************
;Function : interruption, sampling ADE3
;******************************************************************************
;AD converter steps to set up :
;1. set ADE11-ADE0 ADICL in ADICH , enabling analog input channels,
;2. Register set up ADICH choice ADC reference voltage; 
; 3. set ADIS3:ADIS0 in ADCR choose AD input channels
; Register set up the ADCKR1-ADCKR0 ADCR, chose to pre - ADC clock frequency
; AD home ADPD=1 began sampling. 
;4. May need to enable ADC and total suspended 
;5. According to the need for the calibration channel ADC
; 6. If the need to resort to interrupt function, which set TEST ADIE=1; implementation ENI orders
; 7. ADRUN=1 home ADCR which began AD converter
; 8. wait for the interruption or ADRUN was purged 0; If AD interruption, money ADIF.
; 9. Preservation conversion results. If so many AD converter, proceed to step 6 
;********************************************************************************
ADC_LOW    == 0X14                        
ADC_HIGH   == 0X15                        
;
           INCLUDE   "EM78P510.INC"
           ;
           ORG       0X0000
           JMP       RESET
           ;
           ORG       0X0012
           JMP       ADC_INT
ADC_INT:
           BANK      0
           BC        ISR, ADIF
           BANK      3
           MOV       A, RD                ;
           BANK      0
           AND       A, @0X0F
           MOV       ADC_LOW,A
           BANK      3
           SWAPA     RC
           BANK      0           
           MOV       ADC_HIGH, A
           AND       A, @0X0F0
           OR        ADC_LOW, A
           MOV       A, @0X0F
           AND       ADC_HIGH, A
           RETI 
RESET:
           DISI
           CALL      SUB_RINIT
           CALL      SUB_ADJ
           BS        IMR, ADIE
           BC        ISR, ADIF
           ENI
MAIN:
           BANK      3
           MOV       A, @0X83             ;SELECT ADE3,ADRUN=1
           OR        ADCR, A
           BANK      0
           NOP
           NOP
           JMP       MAIN
           ;           
SUB_ADJ:
           BANK     3
           BS       ADICH, CALI             ;ENABLE CALIBRATION
_ADJ_LOOP:           
           BS       ADCR, ADRUN
           JBC      ADCR, ADRUN
           JMP      $-1
           MOV      A, ADDL
           AND      A, @0X0F
           JBS      R3, Z
           JMP      _ADJ_DONE
           MOV      A, ADDH
           JBS      R3, Z
           JMP      _ADJ_DONE
           MOV      A, @0X10
           ADD      ADDL, A
           JMP      _ADJ_LOOP           
_ADJ_DONE:
           BC       ADICH, CALI
           BANK     0
           RET
           ;
SUB_RINIT:
           BANK      3
           MOV       A, @0X0F
           MOV       ADICL, A              ;SELECT ADE0~ ADE3 AS ANALOG INPUT
           CLR       ADICH                 ;VREFS==VDD
           MOV       A, @0X60
           MOV       ADCR, A               ;SELECT  AD0,SELECT ADCKR1/ADCKR0=1:0,ADP=1
           BANK      0
           CLR       ADC_LOW
           CLR       ADC_HIGH
           RET
           ;                  
           END