HT56R26 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT56R26' PDF : 134 Pages View PDF
HT56R22/HT56R23/HT56R24/HT56R25/HT56R26
Example: using an EOCB polling method to detect the end of conversion
clr EADI
mov a,00000001B
mov ACSR,a
mov a,00100000B
mov ADCR,a
:
:
:
Start_conversion:
clr START
set START
clr START
Polling_EOC:
sz EOCB
jmp polling_EOC
mov a,ADRL
mov adrl_buffer,a
mov a,ADRH
mov adrh_buffer,a
:
jmp start_conversion
; disable ADC interrupt
; select fSYS/8 as A/D clock and turn on ADONB bit
; setup ADCR register to configure Port PB0~PB3
; as A/D inputs
; and select AN0 to be connected to the A/D converter
; As the Port B channel bits have changed the
; following START
; signal (0-1-0) must be issued
; instruction cycles
; reset A/D
; start A/D
; poll the ADCR register EOCB bit to detect end
; of A/D conversion
; continue polling
; read low byte conversion result value
; save result to user defined register
; read high byte conversion result value
; save result to user defined register
; start next A/D conversion
Example: using the interrupt method to detect the end of conversion
clr EADI
mov a,00000001B
mov ACSR,a
; disable ADC interrupt
; select fSYS/8 as A/D clock and turn on ADONB bit
mov a,00100000B
; setup ADCR register to configure Port PB0~PB3
; as A/D inputs
mov ADCR,a
; and select AN0 to be connected to the A/D
:
; As the Port B channel bits have changed the
; following START signal(0-1-0) must be issued
;
:
Start_conversion:
clr START
set START
; reset A/D
clr START
; start A/D
clr ADF
; clear ADC interrupt request flag
set EADI
; enable ADC interrupt
set EMFI
; enable multi-function interrupt
set EMI
; enable global interrupt
:
:
:
; ADC interrupt service routine
ADC_:
mov acc_stack,a
; save ACC to user defined memory
a,STATUS
mov status_stack,a
; save STATUS to user defined memory
:
:
mov a,ADRL
; read low byte conversion result value
mov adrl_buffer,a
; save result to user defined register
mov a,ADRH
; read high byte conversion result value
mov adrh_buffer,a
; save result to user defined register
:
:
EXIT__ISR:
mov a,status_stack
mov STATUS,a
; restore STATUS from user defined memory
mov a,acc_stack
; restore ACC from user defined memory
clr ADF
; clear ADC interrupt flag
reti
Rev. 1.30
65
December 26, 2014
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