User’s Manual U12688EJ4V0UM00
315
CHAPTER 11 A/D CONVERTER
11.1 Features
{
Analog input: 8 channels
{
10-bit A/D converter
{
On-chip A/D conversion result register (ADCR0 to ADCR7)
10 bits
×
8
{
A/D conversion trigger mode
A/D trigger mode
Timer trigger mode
External trigger mode
{
Successive approximation method
11.2 Configuration
The A/D converter of the V850E/MS1 adopts the successive approximation method, and uses the A/D converter
mode registers (ADM0, ADM1), and ADCRn register to perform A/D conversion operations (n = 0 to 7).
(1) Input circuit
Selects the analog input (ANI0 to ANI7) according to the mode set to the ADM0 and ADM1 registers and
sends the input to the sample and hold register.
(2) Sample and hold circuit
The sample and hold circuit samples each of the analog input signals sequentially sent from the input circuit,
and sends the sample to the voltage comparator. This circuit also holds the sampled analog input signal
voltage during A/D conversion.
(3) Voltage comparator
The voltage comparator compares the analog input signal with the output voltage of the series resistor string.
(4) Series resistor string
The series resistor string is used to generate voltages to match analog inputs.
The series resistor string is connected between the reference voltage pin (AV
REF
) for the A/D converter and the
GND pin (AV
SS
) for the A/D converter. To make 1,024 equal voltage steps between these 2 pins, it is
configured from 1,023 equal resistors and 2 resistors with 1/2 of the resistance value.
The voltage tap of the series resistor string is selected by a tap selector controlled by a successive
approximation register (SAR).
Содержание V850E/MS1 UPD703100
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