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Chapter 14
A/D Converter
Preliminary User’s Manual U14913EE1V0UM00
14.9 Precautions
14.9.1 Stopping conversion operation
If the CE bit of the ADSCM0 register is cleared during conversion operation, all conversion operations
are stopped, and a conversion result is not stored in the ADCRm register (m = 0 to 11).
14.9.2 Trigger input during conversion operation
If a trigger is input during conversion operation, that trigger input is ignored.
14.9.3 Timer trigger interval
Make the trigger interval (input time interval) in timer trigger mode longer than the conversion time
specified by the FR2 to FR0 bits of the ADSCM1 register.
(1)
When interval = 0
If multiple triggers are input simultaneously, the analog input whose ANIm pin number is smallest is
converted. The other trigger signals input at the same time are ignored (m = 0 to 11).
(2)
When 0 < interval < conversion time
If a timer trigger is input during conversion operation, that trigger input is ignored.
If conversion operation is suspended, a conversion result is not stored in the ADCRm register
(m = 0 to 11).
(3)
When interval = conversion time
If a timer trigger is input at the same time when the conversion terminates, interrupt generation and
ADCRm register storage of the actual value are performed correctly.
14.9.4 Operation in standby modes
(1)
HALT mode
The A/D converter continues the operation. When recover from HALT mode the ADSCM0,
ADSCM1 and ADCRm registers maintain their values (m = 0 to 11).
(2)
WATCH mode, IDLE mode, software STOP mode
Since clock supply to A/D converter stops, conversion operation is not performed.
If released by RESET, NMI, or maskable interrupt input, the ADSCM0, ADSCM1 and ADCRm reg-
isters maintain their values.
However, if IDLE mode or software STOP mode is set during conversion operation, conversion
operation stops. If released by NMI input, conversion resumes but the conversion result written in
the ADCRm register becomes undefined (m = 0 to 11).
Remark:
Connecting the AV
REF
pin to AV
SS
in IDLE mode, or software STOP mode will further
reduce the power consumption.
Содержание V850E/CA1 ATOMIC
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