CHAPTER 11 A/D CONVERTER
User’s Manual U13850EJ6V0UD
446
(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 backup 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 11-8.
Figure 11-8. Handling of AV
DD
Pin
AV
REF
V
DD
V
SS
AV
DD
AV
SS
Main power supply
Backup
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. Therefore, read the A/D conversion result during A/D
conversion (ADCS = 1). Incorrect conversion results may be read out at a timing other than the above.
Содержание V850/SB1
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