HT68F03 datasheet(103/139 Pages) HOLTEK

103 / 139 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.00

103

April 16, 2010

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,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:

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

Example: using the interrupt 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,00h

mov

ACERH,00h

; ACERH is only for HT66F60

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

clr

ADF

; clear ADC interrupt request flag

set

ADE

; enable ADC interrupt

set

EMI

; enable global interrupt

; ADC interrupt service routine

ADC_ISR:

mov

acc_stack,a

; save ACC to user defined memory

mov

a,STATUS

mov

status_stack,a

; save STATUS to user defined memory

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

EXIT_INT_ISR:

mov

a,status_stack

mov

STATUS,a

; restore STATUS from user defined memory

mov

a,acc_stack

; restore ACC from user defined memory

reti

HT68F03 Datasheet(PDF) 103 Page - Holtek Semiconductor Inc

HT68F03 Datasheet(HTML) 103 Page - Holtek Semiconductor Inc

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