CHAPTER 11 A/D CONVERTER
User’s Manual U13850EJ4V0UM
359
(8) AV
DD
pin
The AV
DD
pin is the power supply pin of the analog circuit, and also supplies power to the input circuit of ANI0 to
ANI11. Even in an application where a back-up power supply is used, therefore, be sure to apply the same
voltage as the V
DD
pin to the AV
DD
pin as shown in Figure 11-11.
Figure 11-11. Handling of AV
DD
Pin
AV
REF
V
DD
V
SS
AV
DD
AV
SS
Main power supply
Back-up
capacitor
(9) Reading out A/D converter result register (ADCR)
A write operation to A/D converter mode register 1 (ADM1) and the analog input channel specification register
(ADS) may cause the ADCR contents to be undefined. After the conversion, read out the conversion result
before the write operation to ADM1 and ADS is performed. Incorrect conversion results may be read out at
timings other than the above.
Содержание MPD703030A
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