NEC V850E/PH2, User Manual

Page: 582 / 1053

582
Chapter 14 A/D Converter
User’s Manual U16580EE3V1UD00
The correspondence between each analog input pin and the ADCRnm register is shown in Table 14-1
below.
The relationship between the analog voltage input to the analog input pins (ANIn0 to ANIn9) and the
A/D conversion result (of the A/D conversion result register (ADCRnm)) is as follows:
or,
INT( ): Function that returns the integer value
V
IN
: Analog input voltage
AV
REF
: AV
REF
pin voltage
ADCR: Value of A/D conversion result register (ADCRnm)
Figure 14-7 shows the relationship between the analog input voltage and the A/D conversion results.
Remark: n = 0, 1
m = 0 to 9
Table 14-1: Assignment of A/D Conversion Result Registers to Analog Input Pins
Analog Input Pin Assignment of A/D Conversion Result Registers
Select 1 Buffer Mode/
Scan Mode
Select 4 Buffer Mode
ANIn0 ADCRn0, ADCRn0H ADCRn0 to ADCRn3,
ADCRn0H to ADCRn3H
ANIn1 ADCRn1, ADCRn1H
ANIn2 ADCRn2, ADCRn2H
ANIn3 ADCRn3, ADCRn3H
ANIn4 ADCRn4, ADCRn4H ADCRn4 to ADCRn7,
ADCRn4H to ADCRn7H
ANIn5 ADCRn5, ADCRn5H
ANIn6 ADCRn6, ADCRn6H
ANIn7 ADCRn7, ADCRn7H
ANIn8 ADCRn8, ADCRn8H ADCRn8 to ADCRn9,
ADCRn8H to ADCRn9H
ANIn9 ADCRn9, ADCRn9H
ADCR INT
V
IN
AV
REF
------------------
1024
×
0,5 +
⎝ ⎠
⎛ ⎞
=
ADCR 0,5 –
( )
AV
REF
1024
------------------
×
V
IN
ADCR 0,5 +
( )
AV
REF
1024
------------------
× < ≤