upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 158

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

9.4.2
A/D conversion result (stored in the 10-bit A/D conversion result register (ADCR)) is shown by the following
expression.
158
The relationship between the analog input voltage input to the analog input pins (ANI0 to ANI3) and the theoretical
or
where, INT( ):
Figure 9-11 shows the relationship between the analog input voltage and the A/D conversion result.
ADCR = INT (
(ADCR − 0.5) ×
Input voltage and conversion results
A/D conversion result
V
V
ADCR: 10-bit A/D conversion result register (ADCR) value
AIN
DD
Figure 9-11. Relationship Between Analog Input Voltage and A/D Conversion Result
:
:
Function which returns integer part of value in parentheses
Analog input voltage
V
DD
V
V
1024
V
AIN
DD
pin voltage
DD
× 1024 + 0.5)
≤ V
AIN
< (ADCR + 0.5) ×
1023
1022
1021
SAR
3
2
1
0
CHAPTER 9 A/D CONVERTER
2048
1
User’s Manual U16994EJ3V0UD
1024
1
2048
1024
3
V
DD
1024
2
2048
5
Input voltage/AV
1024
3
2043
2048
REF
1022
1024
2045
2048
1023
1024
2047
2048
ADCR
1
03FFH
03FEH
03FDH
0003H
0002H
0001H
0000H