upd78f0124m6gba1-8et Renesas Electronics Corporation., upd78f0124m6gba1-8et Datasheet - Page 243
upd78f0124m6gba1-8et
Manufacturer Part Number
upd78f0124m6gba1-8et
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0124M6GBA1-8ET.pdf
(545 pages)
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12.4.2 Input voltage and conversion results
A/D conversion result (stored in the A/D conversion result register (ADCR)) is shown by the following expression.
The relationship between the analog input voltage input to the analog input pins (ANI0 to ANI7) and the theoretical
or
where, INT( ):
Figure 12-10 shows the relationship between the analog input voltage and the A/D conversion result.
SAR = INT (
ADCR = SAR × 64
(ADCR − 0.5) ×
A/D conversion result
V
AV
ADCR: A/D conversion result register (ADCR) value
SAR:
AIN
Figure 12-10. Relationship Between Analog Input Voltage and A/D Conversion Result
REF
:
:
AV
Function which returns integer part of value in parentheses
Analog input voltage
AV
Successive approximation register
V
AIN
(ADCR)
REF
AV
1024
REF
REF
× 1024 + 0.5)
pin voltage
≤ V
AIN
< (ADCR + 0.5) ×
1023
1022
1021
SAR
3
2
1
0
CHAPTER 12 A/D CONVERTER
2048
1
User’s Manual U16315EJ3V1UD
1024
1
2048
AV
1024
3
REF
1024
2
2048
5
Input voltage/AV
1024
3
2043
2048
REF
1022
1024
2045
2048
1023
1024
2047
2048
ADCR
1
FFC0H
FF80H
FF40H
00C0H
0080H
0040H
0000H
243
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