HT46R46 datasheet(32/77 Pages) HOLTEK

32 / 77 page

HT46R46/C46/R47/C47/R48A/C48A/R49

Rev. 1.30

June 5, 2008

Example: using an interrupt method to detect the end of conversion for the HT46R46

clr

EADI

; disable ADC interrupt

mov

a,00000001B

mov

ACSR,a

; setup the ACSR register to select fSYS/8 as

; the A/D clock

mov

a,00100000B

; setup ADCR register to configure Port PB0~PB3

; as A/D inputs

mov

ADCR,a

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

; converter

; As the Port B channel bits have changed the

; following START

; signal (0-1-0) must be issued within 10

; instruction cycles

Start_conversion:

clr

START

set

START

; reset A/D

clr

START

; start A/D

clr

ADF

; clear ADC interrupt request flag

set

EADI

; 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,ADR

; read conversion result value from the ADR

; register

mov

adr_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

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