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HT56RB688 データシート(PDF) 68 Page - Holtek Semiconductor Inc

部品番号 HT56RB688
部品情報  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RB688 データシート(HTML) 68 Page - Holtek Semiconductor Inc

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Example: using the interrupt method to detect the end of conversion
clr
EADI
; disable ADC interrupt
mov
a,00000001B
mov
ACSR,a
; select fSYS/8 as A/D clock and turn on ADONB bit
mov
a, 0FH
mov
ADPCR,a
; setup ADPCR register to configure Port A pin PA0~PA3
Mov
a, 00H
; as A/D inputs
mov
ADCR,a
; and select AN0 to be connected to the A/D converter
:
; As the Port A 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
EMI
; enable global interrupt
:
:
:
; ADC interrupt service routine
ADC_:
mov
acc_stack,a
; save ACC to user defined memory
mov
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. 1.10
68
April 15, 2013
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces


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