HT46R0664 datasheet(62/92 Pages) HOLTEK

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HT46R0664

Enhanced A/D+LCD Type 8-Bit OTP MCU

A/ D Co nv er si on

Re su lt

FFFH

FF EH

FF DH

03 H

02 H

01 H

0. 5LS B

1. 5LS B

4093 4094 4095 4 096

V DD or V RE F

4096

(

)

An al og I npu t V ol t age

Ideal A/D Transfer Function

A/D Programming Example

The following two programming examples illustrate how to setup and implement an A/D

conversion. In the first example, the method of polling the EOCB bit in the ADCR register is used to

detect when the conversion cycle is complete, whereas in the second example, the A/D interrupt is

used to determine when the conversion is complete.

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

clr ADE

; disable ADC interrupt

mov a,00000001B

mov ACSR,a

; select fSYS/8 as A/D clock and ADONB=0

mov a,00000000B

; setup ANCSR1/ANCSR0 register to configure Port

; as A/D inputs

mov ANCSR1,a

mov a,00000001B

mov ANCSR0,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 ADCR 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

HT46R0664 Datasheet(PDF) 62 Page - Holtek Semiconductor Inc

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