NEC PD78058FY(A) User Manual
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CHAPTER 14 A/D CONVERTER
(7) AV
DD
pin
The AV
DD
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 V
DD
and AV
DD
and connect separate
grounds to V
SS
and AV
SS
.
(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