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11.1 A/D Converter Functions
A/D converter is an 8-bit resolution converter that converts analog inputs into digital values. It can control up to
8 analog input channels (ANI0 to ANI7).
A/D conversion operation is started by setting the A/D converter mode register (ADM0).
Select one channel for analog input from ANI0 to ANI7 to perform A/D conversion. A/D conversion operation is
repeated. Each time an A/D conversion operation ends, an interrupt request (INTAD0) is generated.
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
3
ADS02 ADS01 ADS00
Analog input channel
specification register (ADS0)
CHAPTER 11 A/D CONVERTER
Figure 11-1. A/D Converter Block Diagram
Sample & hold circuit
Control circuit
ADCS0 FR02 FR01 FR00
A/D converter
mode register (ADM0)
Internal bus
Preliminary User's Manual U13420EJ2V0UM00
Serial resistor string
Voltage comparator
Successive
approximation
register (SAR)
A/D conversion
result register (ADCR0)
AV
REF
(Also used as
analog power supply)
AV
SS
INTAD0
173
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