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Chapter 14
A/D Converter
Preliminary User’s Manual U14913EE1V0UM00
14.7 Operation in A/D Trigger Polling Mode
Setting the CE bit of the ADSCM0 register to 1 starts the A/D conversion immediately.
Both select mode and scan mode can be continued with A/D trigger polling mode. Since the CS bit of
the ADSCM0 register remains 1 after an INTAD interrupt in this mode, it is not necessary to set the CE
bit to restart the A/D conversion.
14.7.1 Operation in select mode
The analog input specified in the ADSCM0 register is A/D converted. The conversion result is stored in
the ADCRm register (m = 0 to 11).
One analog input is A/D converted at a time and the result is stored in one ADCRm register. Analog
inputs correspond one-to-one with ADCRm register.
An A/D conversion termination interrupt (INTAD) is generated for each A/D conversion termination.
A/D conversion operation is repeated until the CE bit = 0 (CS bit = 1).
In A/D trigger polling mode, it is not necessary to set the CE bit of the ADSCM0 register to restart the
A/D conversion operation
Note
.
This is optimal for applications that regularly read A/D conversion values.
Note: If the ADCRm register is not read before the next A/D conversion has been finished, its con-
tents is overwritten.
Remark:
m = 0 to 11
Figure 14-11: Example of Select Mode (A/D Trigger Polling Select) Operation (ANI2)
Analog input
A/D conversion result register
ANIm
ADCRm
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
:
ADCR0
ADCR1
ADCR2
ADCR3
ADCR4
ADCR5
:
ADCR11
A/D converter
ADSCM0
(1) CE bit of ADSCM0 = 1 (Enabled)
(2) A/D conversion of ANI2
(3) Store conversion result in ADCR2
(4) Generate INTAD interrupt
(5) Return to (2)
ANI11
Содержание V850E/CA1 ATOMIC
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