HT45F65 datasheet(147/231 Pages) HOLTEK

147 / 231 page

Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

FF EH

(

)

A/ D C onv er si on

Re su lt

FFFH

FF DH

03H

02H

01H

0. 5 LS B

409 3 4094 4095 409 6

A nal og In pu t Vo lt age

1. 5 LS B

V DD

409 6

Ideal A/D Transfer Function

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

clr ADOFF

mov a, 00H

; setup ADCR0 register to configure Port as A/D inputs

mov ADCR0, a

; and select AN0 to be connected to the A/D converter

Start_conversion:

clr START

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

Note:TopowerofftheADC,itisnecessarytosetADOFFas"1".

HT45F65 Datasheet(PDF) 147 Page - Holtek Semiconductor Inc

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