HT45F5R datasheet(99/138 Pages) HOLTEK

99 / 138 page

Rev. 1.10

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Rev. 1.10

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HT45F5R

Charger ASSP Flash MCU

HT45F5R

Charger ASSP Flash MCU

A/D Conversion Programming Examples

ThefollowingtwoprogrammingexamplesillustratehowtosetupandimplementanA/Dconversion.

Inthefirstexample,themethodofpollingtheADBZbitintheSADC0registerisusedtodetect

whentheconversioncycleiscomplete,whereasinthesecondexample,theA/Dinterruptisusedto

determinewhentheconversioniscomplete.

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

clr ADE

; disable ADC interrupt

mov a,03H

mov SADC1,a

; select fSYS/8 as A/D clock

set ADCEN

mov a,0Ch

; setup PAS0 to configure pin AN0

mov PAS0,a

mov a,20h

mov SADC0,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 ADBZ

; poll the SADC0 register ADBZ bit to detect end of A/D conversion

jmp polling_EOC

; continue polling

mov a,SADOL

; read low byte conversion result value

mov SADOL_buffer,a ; save result to user defined register

mov a,SADOH

; read high byte conversion result value

mov SADOH_buffer,a ; save result to user defined register

jmp start_conversion ; start next A/D conversion

HT45F5R Datasheet(PDF) 99 Page - Holtek Semiconductor Inc

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