HT45F39 datasheet(65/102 Pages) HOLTEK

65 / 102 page

Rev. 1.10

July 01, 2016

Rev. 1.10

July 01, 2016

HT45F39/HT45F391

Ultrasonic Distance Measurement 8-bit Flash MCU

HT45F39/HT45F391

Ultrasonic Distance Measurement 8-bit Flash MCU

t AD C

A/ D c onv er si on ti me

00011B

00010B

ST AR T

EO CB

AC S2 ~A CS 0

Po we r- on

Re se t

E nd of A /D

c onv er si on

1: D ef i ne por t co nf i gur at io n

2: S el ec t anal og ch a nnel

St ar t of A /D

c onv er si on

Re se t A/ D

c onv er te r

A/ D sa mp li ng ti me

t AD S

00000B

St ar t of A /D

c onv er si on

Re se t A/ D

c onv er te r

00001B

St ar t o f A /D

c onv er si on

Re se t A/ D

c onv er te r

E nd of A /D

c onv er si on

A/ D sa mp li ng ti me

t AD S

of f

t ON 2S T

t AD C

A/ D c onv er si on ti me

of f

AD ON B

AD C M odul e

A/D Conversion Timing

A/D Programming Examples

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 1.04V

clr ADOFF

mov a,0Fh

; setup ACERL to configure pins AN0~AN3

mov ACERL,a

mov a,00h

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,ADR

; read low byte conversion result value

mov ADR_buffer,a

; save result to user defined register

jmp start_conversion ; start next A/D conversion

Note:TopowerofftheADC,itisnecessarytosetADOFFas"1".

HT45F39 Datasheet(PDF) 65 Page - Holtek Semiconductor Inc

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