CHAPTER 12 10-BIT A/D CONVERTER (
µ
PD789114, 789134 SUBSERIES)
User’s Manual U13045EJ2V0UM00
161
Figure 12-11. A/D Conversion End Interrupt Request Generation Timing
Remarks
1. n = 0, 1, 2, 3
2. m = 0, 1, 2, 3
(9) AV
DD
pin
The AV
DD
pin is used to supply power to the analog circuit. It is also used to supply power to the ANI0 to ANI3
input circuit.
Therefore, if the application is designed to be changed to backup power, the AV
DD
pin must be supplied with
the same voltage level as for the V
DD
pin, as shown in Figure 12-10.
Figure 12-12. AV
DD
Pin Treatment
(10) Input impedance of the AV
DD
pin
A series resistor string of several 10 k
Ω
is connected across the AV
DD
and AV
SS
pins.
Therefore, if the output impedance of the reference voltage source is high, this high impedance is eventually
connected in parallel with the series resistor string across the AV
DD
and AV
SS
pins, leading to a higher reference
voltage error.
Rewriting to ADM0
(to begin conversion
for ANIn)
A/D conversion
ADCR0
INTAD0
ANIn
ANIn
ANIm
ANIn
ANIn
ANIm
ANIm
ANIm
Rewriting to ADM0
(to begin conversion
for ANIm)
ADIF0 has been set, but conversion
for ANIm has not been completed.
Main power
source
Backup
capacitor
V
DD
AV
DD
V
SS
AV
SS
Summary of Contents for mPD789101
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