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HT46R01B-1 Datasheet(PDF) 48 Page - Holtek Semiconductor Inc

Part No. HT46R01B-1
Description  Small Package 8-Bit OTP MCU
Download  71 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R01B-1 Datasheet(HTML) 48 Page - Holtek Semiconductor Inc

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HT46R01B-1/HT46R01N-1
HT48R01B-1/HT48R01N-1
Rev.1.00
48
June 9, 2011
A/D Programming Example
The following two programming examples illustrate how to setup and implement an A/D conversion. In the first exam-
ple, the method of polling the EOCB bit in the ADCR register is used to detect when the conversion cycle is complete,
whereas in the second example, the A/D interrupt is used to determine when the conversion is complete.
Example: using an EOCB polling 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,00000100B
; setup ADCR register to configure Port as A/D inputs
mov
ADCR,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
Polling_EOC:
sz
EOCB
; poll the ADCR 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
Note: To power off ADC module, it is necessary to set ADONB as
²1².
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,00000100B
; setup ADCR register to configure Port as A/D inputs
mov
ADCR,a
; and select AN0 to be connected to the A/D
:
:
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
²1².


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