User’s Manual U18172EJ2V0UD
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CHAPTER 9 A/D CONVERTER
9.1 Functions of A/D Converter
The A/D converter converts an analog input signal into a digital value, and consists of up to four channels (ANI0 to
ANI3) with a resolution of 10 bits.
The A/D converter has the following function.
•
10-bit resolution A/D conversion
10-bit resolution A/D conversion is carried out repeatedly for one channel selected from analog inputs ANI0 to
ANI3. Each time an A/D conversion operation ends, an interrupt request (INTAD) is generated.
Figure 9-1 shows the timing of sampling and A/D conversion, and Table 9-1 shows the sampling time and A/D
conversion time.
Figure 9-1. Timing of A/D Converter Sampling and A/D Conversion
ADCS
Conversion time
Conversion time
Sampling
time
Sampling
timing
INTAD
ADCS
←
1 or ADS rewrite
Sampling
time
Note
Note
2 or 3 clocks are required from the ADCS rising to sampling start.