UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 215

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

11.5 Notes on A/D Converter
(1) Current consumption in standby mode
(2) ANI0 to ANI7 input range
(3) Conflict
The A/D converter stops operating in the standby mode. At this time, the current consumption can be reduced
by stopping the conversion operation (by clearing bit 7 (ADCS0) of A/D converter mode register 0 (ADM0)
to 0). An example of reducing the current consumption in standby mode is shown in Figure 11-8.
Observe the rated range of the ANI0 to ANI7 input voltage. If a voltage of AV
(even within the range of absolute maximum ratings) is input to an analog input channel, the converted value
of that channel becomes undefined. In addition, the converted values of the other channels may also be
affected.
<1> Conflict between writing A/D conversion result register 0 (ADCR0) on completion of conversion
<2> Conflict between writing ADCR0 on completion of conversion and external trigger signal input
<3> Conflict between writing ADCR0 on completion of conversion and writing A/D converter mode
and reading ADCR0 by instruction
Reading ADCR0 has priority. After it has been read, a new conversion result is written to ADCR0.
The external trigger signal is not acknowledged during A/D conversion. Therefore, the external trigger
signal is not acknowledged while ADCR0 is being written.
register 0 (ADM0) or writing analog input channel specification register 0 (ADS0)
Writing ADM0 or ADS0 has priority. ADCR0 is not written. The conversion end interrupt request signal
(INTAD0) is not generated.
Figure 11-8. Example of Reducing Current Consumption in Standby Mode
AV
AV
REF
SS
CHAPTER 11 A/D CONVERTER
User’s Manual U13029EJ7V1UD
P-ch
Series resistor string
ADCS0
REF
or higher, or AV
SS
or lower
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