535
Chapter 15
A/D Converter
Preliminary User’s Manual U15839EE1V0UM00
15.3.2 Input voltage and conversion results
The relation between the analog input voltage input to the analog input pins (ANI0 to ANI11) and the
A/D conversion result (stored in the A/D conversion result registers (ADCR)) is shown by the following
expression:
or the following expression:
where,
INT( ):
Function which returns integer part of value in parentheses
V
IN
:
Analog input voltage
AV
DD
:
AV
DD
pin voltage and A/D converter power supply
ADCRL: A/D conversion result register (ADCRL) value
Figure 15-9, “Relation between Analog Input Voltage and A/D Conversion Result,” on page 536 shows
the relation between the analog input voltage and the A/D conversion result.
ADCR = INT
(AV
IN
×
1024)
AV
REF
±
0,5) ]
×
64
[ (
(ADCR/64 – 0.5)
×
AV
REF
(ADCR/64 + 0.5)
×
AV
REF
1024
1024
<= V
IN
<
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