Renesas RL78/G10 User Manual

RL78/G10 CHAPTER 10 A/D CONVERTER
R01UH0384EJ0311 Rev. 3.11 255
Dec 22, 2016
10.5 Input Voltage and Conversion Results
The relationship between the analog input voltage input to the analog input pins (ANI0 to ANI6
Note
, internal reference
voltage) and the theoretical A/D conversion result (stored in the A/D conversion result register (ADCR = ADCRH +
ADCRL)) is shown by the following expression.
SAR = INT ( × 1024 + 0.5)
ADCR = SAR × 64
or
( − 0.5) × ≤ V
AIN < ( + 0.5) ×
where, INT( ): Function which returns integer part of value in parentheses
V
AIN: Analog input voltage
ADCR: A/D conversion result register (ADCRH + ADCRL) value
SAR: Successive approximation register
Note For 10-pin products, ANI0 to ANI3.
Figure 10-13 shows the relationship between the analog input voltage and the A/D conversion result.
Figure 10-13. Relationship Between Analog Input Voltage and A/D Conversion Result
1023
1022
1021
3
2
1
0
FFC0H
FF80H
FF40H
00C0H
0080H
0040H
0000H
A
/D conversion result
SAR ADCR
1
2048
1
1024
3
2048
2
1024
5
2048
Input voltage/V
DD
3
1024
2043
2048
1022
1024
2045
2048
1023
1024
2047
2048
1
V
AIN
V
DD
VDD
1024
VDD
1024
ADCR
64
ADCR
64

Renesas RL78/G10 Specifications

General

Brand	Renesas
Model	RL78/G10
Category	Motherboard
Language	English