Renesas RL78/G1H User Manual

RL78/G1H CHAPTER 13 A/D CONVERTER
R01UH0575EJ0120 Rev. 1.20 Page 305 of 920
Dec 22, 2016
13.5 Input Voltage and Conversion Results
The relationship between the analog input voltage input to the analog input pins and the theoretical A/D conversion
result (stored in the 10-bit A/D conversion result register (ADCR)) is shown by the following expression.
or
where, INT( ): Function which returns integer part of value in parentheses
V
AIN: Analog input voltage
AV
REF:AVREF pin voltage
ADCR: A/D conversion result register (ADCR) value
SAR: Successive approximation register
Figure 13 - 17 shows the Relationship Between Analog Input Voltage and A/D Conversion Result.
Figure 13 - 17 Relationship Between Analog Input Voltage and A/D Conversion Result
Remark AVREF: The + side reference voltage of the A/D converter. This can be selected from AVREFP, and VDD.
SAR = INT ( × 1024 + 0.5)
ADCR = SAR × 64
V
AIN
AVREF
( − 0.5) × ≤ VAIN < ( + 0.5) ×
ADCR
64
AVREF
1024
ADCR
64
AVREF
1024
1
2048
1
1024
3
2048
2
1024
5
2048
3
1024
1023
1022
1021
3
2
1
0
FFC0H
FF80H
FF40H
00C0H
0080H
0040H
0000H
A/D conversion result
SAR ADCR
Input voltage/AVREF
1
2043
2048
1022
1024
2045
2048
1023
1024
2047
2048

Renesas RL78/G1H Specifications

General

Brand	Renesas
Model	RL78/G1H
Category	Microcontrollers
Language	English