490
Chapter 14
A/D Converter
Preliminary User’s Manual U14913EE1V0UM00
Figure 14-1: Block Diagram of A/D Converter
Cautions: 1. Noise at an analog input pin (ANIm) or reference voltage input pin (AV
REF
) may give
rise to an invalid conversion result.
Software processing is needed in order to prevent this invalid conversion result
from adversely affecting the system.
The following are examples of software processing.
•Use the average value of the results of multiple A/D conversions as the A/D con-
version 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.
2. Be sure that voltages outside the range [AV
SS
to AV
REF
] are not applied to pins
being used as A/D converter and input pins.
ADSCM0 (16)
15
0
INTAD
Sample and
hold circuit
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
:
16
16
16
ADSCM1 (16)
15
0
ADETM (16)
15
0
9
0
Controller
10
10
SAR (10)
Comparator
and D/A
converter
AV
DD
AV
REF
AV
SS
INTDET
ADCR0
ADCR1
ADCR2
ADCR3
ADCR4
ADCR5
:
ADCR11
Internal bus
Input circuit
ANI11
INTPE10/TINTCCE10
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