HT46R46/C46/R47/C47/R48/R49
Example: using an interrupt method to detect the end of conversion for the HT46R46
; disable ADC interrupt
clr EADI
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
clr START
clr ADF
set EADI
set EMI
; reset A/D
; start A/D
; clear ADC interrupt request flag
; enable ADC interrupt
; enable global interrupt
:
:
:
; ADC interrupt service routine
ADC_ISR:
mov acc_stack,a
mov a,STATUS
mov status_stack,a
:
; save ACC to user defined memory
; save STATUS to user defined memory
:
mov a,ADR
; read conversion result value from the ADR
; register
; save result to user defined register
mov adr_buffer,a
:
:
EXIT_INT_ISR:
mov a,status_stack
mov STATUS,a
mov a,acc_stack
reti
; restore STATUS from user defined memory
; restore ACC from user defined memory
Rev. 1.00
32
April 18, 2007
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
