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CHAPTER 14 A/D CONVERTER
256
14.4.2 Input voltage and conversion results
The relationship between the analog input voltage input to the analog input pins (ANI0 to ANI7) and the A/D
conversion result (the value stored in the A/D conversion result register (ADCR)) is expressed by the following
expression.
V
IN
ADCR = INT(
×
256 + 0.5)
AV
REF
or
AV
REF
AV
REF
(ADCR – 0.5)
×
≤
V
IN
< (ADCR + 0.5)
×
256
256
where
INT ( ) : Function which returns integer parts of value in parentheses.
V
IN
: Analog input voltage
AV
REF
: AV
REF
pin voltage
ADCR
: A/D conversion result register (ADCR) value
Figure 14-5 shows the relationship between the analog input voltage and the A/D conversion result.
Figure 14-5. Relationship between Analog Input Voltage and A/D Conversion Result
255
254
253
3
2
1
0
A/D Conversion
Results (ADCR)
1
512
1
256
3
512
2
256
5
512
3
256
507
512
254
256
509
512
255
256
511
512
1
Input Voltage/AV
REF
Summary of Contents for 78014Y Series
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