upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 322

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

11.5 Notes on Using A/D Converter
(1) Current consumption in standby mode
(2) Input range of ANI0 to ANI11
(3) Conflict
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The A/D converter stops operation in the IDLE/software STOP mode (operable in the HALT mode). At this time,
the current consumption of the A/D converter can be reduced by stopping the conversion (by resetting the bit 7
(ADCS) of the A/D converter mode register (ADM) to 0).
To reduce the current consumption in the IDLE/software STOP mode, set the AV
the same value (0 V) as the AV
Keep the input voltage of the ANI0 through ANI11 pins to within the rated range. If a voltage greater than or equal
to AV
channel, the converted value of the channel becomes undefined. Moreover, the values of the other channels may
also be affected.
<1> Conflict between writing A/D conversion result register (ADCR) and reading ADCR at end of
<2> Conflict between writing ADCR and external trigger signal input at end of conversion
<3> Conflict between writing of ADCR and writing A/D converter mode register (ADM) or analog input
REF
conversion
Reading ADCR takes precedence. After ADCR has been read, a new conversion result is written to ADCR.
The external trigger signal is not input during A/D conversion. Therefore, the external trigger signal is not
acknowledged during writing of ADCR.
channel specification register (ADS)
When ADM or ADS write is performed immediately after ADCR write following the end or A/D conversion,
the conversion result is not written to the ADCR register, and INTAD is not generated.
or lower than or equal to AV
SS
potential.
CHAPTER 11 A/D CONVERTER
SS
User’s Manual U12768EJ4V1UD
(even within the range of the absolute maximum ratings) is input to a
REF
potential in the user circuit to