CHAPTER 10 8-BIT A/D CONVERTER (
µ
PD789426 AND 789446 SUBSERIES)
User’s Manual U15075EJ2V1UD
200
Figure 10-11. A/D Conversion End Interrupt Request Generation Timing
Rewriting to ADM0
(to begin conversion
for ANIn)
Rewriting to ADM0
(to begin conversion
for ANIm)
A/D conversion
ANIn
ANIn
ANIm
ANIm
ADIF0 has been set, but conversion
for ANIm has not been completed.
ADCR0
ANIn
ANIn
ANIm
ANIm
INTAD0
Remarks 1.
n = 0 to 5
2.
m = 0 to 5
(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
ANI5 input circuit.
If your application is designed to be changed to backup power, the AV
DD
pin must be supplied with the same
voltage level as the V
DD
pin, as shown in Figure 10-12.
Figure 10-12. AV
DD
Pin Handling
Main power
source
Backup
capacitor
V
DD
AV
DD
V
SS
AV
SS
(10) AV
DD
pin input impedance
A series resistor string of several ten of k
Ω
is connected between the AV
DD
and AV
SS
pins. Consequently, if
the output impedance of the reference voltage supply is high, the reference voltage supply will form a parallel
connection with the series resistor string, creating a large reference voltage differential.
Содержание UPD789426 Series
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