HT45F4MA datasheet(102/145 Pages) HOLTEK

102 / 145 page

Rev. 1.20

102

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Rev. 1.20

103

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HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

A/D Programming Example

ThefollowingtwoprogrammingexamplesillustratehowtosetupandimplementanA/Dconversion.

Inthefirstexample,themethodofpollingtheEOCBbitintheADCR0registerisusedtodetect

whentheconversioncycleiscomplete,whereasinthesecondexample,theA/Dinterruptisusedto

determinewhentheconversioniscomplete.

Example: using an EOCB polling method to detect the end of conversion

clr ADE

; disable ADC interrupt

mov a,03H

mov ADCR1,a

; select fSYS/8 as A/D clock and switch off 1.25V

clr ADOFF

mov a,0Fh

; setup ACERL to configure pins AN0~AN3

mov ACERL,a

mov a,01h

mov ADCR0,a

; enable and connect AN0 channel to A/D converter

start_conversion:

clr START

; high pulse on start bit to initiate conversion

set START

; reset A/D

clr START

; start A/D

polling_EOC:

sz EOCB

; poll the ADCR0 register EOCB bit to detect end of A/D conversion

jmp polling_EOC

; continue polling

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

jmp start_conversion

; start next a/d conversion

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