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ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
ANI8
ANI9
ANI10
ANI11
4
ADS3 ADS2 ADS1 ADS0
Analog input channel
8
setting register (ADS)
Cautions: 1. Noise at an analog input pin (ANIm) or reference voltage input pin (AV
give rise to an invalid conversion result.
Software processing is needed in order to prevent this invalid conversion result
from adversely affecting the system.
2. The following are examples of software processing:
•
Use the average value of the results of multiple A/D conversions as the A/D
conversion result.
•
Perform A/D conversion multiple consecutive times and use conversion
results with the exception of any abnormal conversion results that are
obtained.
•
If an A/D conversion result from which it is judged that an abnormality
occurred in the system is obtained, do not perform abnormality processing at
once but perform it upon reconfirming the occurrence of an abnormality.
3. Be sure that voltages outside the range [AV
being used as A/D converter and input pins.
526
Chapter 15 A/D Converter
Figure 15-1: Block Diagram of A/D Converter
Sample & hold circuit
Controller
4
ADCS
FR2
FR1
0
FR3
A/D converter mode
8
register (ADM)
Internal Bus
Preliminary User's Manual U15839EE1V0UM00
approximation
register SAR
INTAD
ADCRH
15
FR0
0
to AV
SS
AV
DD
Comparator
AV
and D/A
REF
Converter
AV
SS
Successive
10
ADCR
ADCRL
8 7
0
A/D conversion result
registers (ADCRL/ADCRH)
8
16
REF
] are not applied to pins
REF
) may
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