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CHAPTER 11 A/D CONVERTER
Preliminary User’s Manual U13420EJ2V0UM00
11.5 A/D Converter Cautions
(1) Current consumption in standby mode
A/D converter stops operating in the standby mode. At this time, current consumption can be reduced by stopping
the conversion operation (by setting bit 7 (ADCS0) of the A/D converter mode register (ADM0) to 0).
Figure 11-7 shows how to reduce the current consumption in the standby mode.
Figure 11-7. Example of Method of Reducing Current Consumption in Standby Mode
(2) Input range of ANI0 to ANI7
The input voltages of ANI0 to ANI7 should be within the specification range. In particular, if a voltage higher
than AV
REF
or lower than AV
SS
is input (even if within the absolute maximum rating range), the conversion value
of that channel will be undefined and the conversion values of other channels may also be affected.
(3) Contending operations
<1>
Contention between A/D conversion result register (ADCR0) write and ADCR0 read by instruction
upon the end of conversion
ADCR0 read is given priority. After the read operation, the new conversion result is written to ADCR0.
<2>
Contention between ADCR0 write and A/D converter mode register (ADM0) write or analog input
channel specification register (ADS0) write
ADM0 or ADS0 write is given priority. ADCR0 write is not performed, nor is the conversion end interrupt
request signal (INTAD0) generated.
AV
REF
AV
SS
P-ch
Series resistor string
ADCS0
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