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CHAPTER 14 A/D CONVERTER
(7) AVDD pin
The AVDD pin is the analog circuit power supply pin, and supplies power to the input circuits of ANI0/P10 to
ANI7/P17.
Therefore, be sure to apply the same voltage as V
DD to this pin even when the application circuit is designed
so as to switch to a backup battery.
Figure 14-12. Connection of AV
DD Pin
Note In order to realize EMI noise reduction, supply power separately to VDD and AVDD and connect separate
grounds to VSS and AVSS.
(8) Port Operations Among A/D Converter Operations
For pins which have common functions with a port (See 3.1.1 or 4.1.1 Normal operating mode pins, (1)
Port pins), do not execute the following operations during A/D conversion. If performed, then the general
error standards cannot be maintained during A/D conversion.
<1> If it is used as a port, rewriting the output latch of its output.
<2> Even if it is not used as a port, changing the output level of pins used as outputs.
Main
power
supply
AV
REF0
V
DD
AV
DD
AV
SS
V
SS
Capacitor
for back-up
Note