NEC V850E/MA1 User Manual page 412

The relationship between the analog voltage input to the analog input pins (ANI0 to ANI7) and the A/D
conversion result (of the A/D conversion result register (ADCRn)) is as follows:
=
ADCR INT (
or,
−
(ADCR 0.5)
INT( ): Function that returns the integer of the value in ( )
V : Analog input voltage
IN
AV : AV
REF REF
ADCR: Value of A/D conversion result register (ADCRn)
Figure 12-2 shows the relationship between the analog input voltage and the A/D conversion results.
Figure 12-2. Relationship Between Analog Input Voltage and A/D Conversion Results
A/D conversion
results (ADCRn)
Remark n = 0 to 7
412
CHAPTER 12
V
IN
× +
1,024 0.5)
AV
REF
AV
REF
× ≤ < +
V (ADCR 0.5)
IN
1,024
pin voltage
1,023
1,022
1,021
3
2
1
0
1 1 3
2,048 1,024 2,048
User's Manual U14359EJ4V0UM
A/D CONVERTER
AV
REF
×
1,024
2 5 3 2,043 1,022
1,024 2,048 1,024 2,048 1,024
Input voltage/AV
REF
2,045 1,023 2,047
1
2,048 1,024 2,048