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Internal bus
A/D converter input select register
ADIS3 ADIS2 ADIS1 ADIS0
4
ANI0/P10
ANI1/P11
ANI2/P12
ANI3/P13
ANI4/P14
ANI5/P15
ANI6/P16
ANI7/P17
ADM1 to ADM3
Falling edge
INTP3/P03
detector
Trigger
enable
CS
TRG
A/D converter mode register
Notes 1. Selector to select the number of channels to be used for analog input
2. Selector to select the channel for A/D conversion
CHAPTER 12 A/D CONVERTER
Figure 12-1.
A/D Converter Block Diagram
Sample & hold circuit
AV
SS
3
3
FR1
FR0 ADM3 ADM2 ADM1
Internal bus
User's Manual U11302EJ4V0UM
Voltage
comparator
Successive
approximation
register (SAR)
Controller
A/D conversion
result register
(ADCR)
Series resistor string
AV
DD
AV
REF
AV
SS
INTAD
INTP3
191
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