HT46R0664 datasheet(63/92 Pages) HOLTEK

63 / 92 page

Rev. 1.00

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HT46R0664

Enhanced A/D+LCD 8-Bit OTP MCU

Example: using the interrupt 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

clr ADF

; clear ADC interrupt request flag

set ADE

; enable ADC interrupt

set EMI

; enable global interrupt

; ADC interrupt service routine

ADC_:

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_ISR:

mov a,status_stack

mov STATUS,a

; restore STATUS from user defined memory

mov a, acc_stack

; restore ACC from user defined memory

clr ADF

; clear ADC interrupt flag

reti

Note: To power off ADC module, it is necessary to set ADONB as “1”.

HT46R0664 Datasheet(PDF) 63 Page - Holtek Semiconductor Inc

HT46R0664 Datasheet(HTML) 63 Page - Holtek Semiconductor Inc

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