UPD78F9418A NEC, UPD78F9418A Datasheet - Page 160

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UPD78F9418A

Manufacturer Part Number
UPD78F9418A
Description
(UPD7894xxA) 8-Bit Single Chip Microcontrollers
Manufacturer
NEC
Datasheet

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11.4.2 Input voltage and conversion result
result (A/D conversion result register 0 (ADCR0)) is represented by:
160
The relationship between the analog input voltage at the analog input pins (ANI0 to ANI6) and the A/D conversion
ADCR0 = INT (
or
(ADCR0 – 0.5) ×
INT( ): Function that returns the integer part of a parenthesized value
V
AV
ADCR0: Value in A/D conversion result register 0 (ADCR0)
Figure 11-5 shows the relationship between the analog input voltage and the A/D conversion result.
IN
:
REF
: AV
Analog input voltage
Figure 11-5. Relationship Between Analog Input Voltage and A/D Conversion Result
REF
A/D conversion
pin voltage
result (ADCR0)
AV
V
AV
1024
IN
REF
REF
× 1024 + 0.5)
≤ V
1023
1022
1021
IN
3
2
1
0
< (ADCR0 + 0.5) ×
2048
1
1024
1
User’s Manual U13952EJ3V0UD
2048
3
1024
2
AV
1024
2048
REF
5
Input voltage/AV
1024
3
2043
2048
REF
1022
1024
2045
2048
1023
1024
2047
2048
1

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