Holtek BS66F340 - Page 155

Rev. 1.60 154 August 20, 2019 Rev. 1.60 155 August 20, 2019
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
Example: using the interrupt method to detect the end of conversion
clr ADE ; disable ADC interrupt
set VREFP_EXT ; deselect the temperature sensor reference voltage
mov a,03H ; select f
SYS
/8 as A/D clock and A/D internal power supply
mov ADCR1,a ; as reference voltage
set ADCEN
mov a,03h ; setup PBS0 to congure pin AN0
mov PBS0,a
mov a,20H
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 ag
set ADE ; enable ADC interrupt
set EMI ; enable global interrupt
:
:
ADC_ISR: ; ADC interrupt service routine
mov acc_stack,a ; save ACC to user dened memory
mov a,STATUS
mov status_stack,a ; save STATUS to user dened memory
:
mov a, ADRL ; read low byte conversion result value
mov ADRL_buffer,a ; save result to user dened register
mov a, ADRH ; read high byte conversion result value
mov ADRH_buffer,a ; save result to user dened register
:
EXIT_INT_ISR:
mov a,status_stack
mov STATUS,a ; restore STATUS from user dened memory
mov a,acc_stack ; restore ACC from user dened memory
reti