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CHAPTER 11 A/D CONVERTER
Preliminary User’s Manual U13420EJ2V0UM00
11.2 A/D Converter Configuration
The A/D converter consists of the following hardware.
Table 11-1. A/D Converter Configuration
Item
Configuration
Analog input
8 channels (ANI0 to ANI7)
Registers
Successive approximation register (SAR)
A/D conversion result register (ADCR0)
Control register
A/D converter mode register (ADM0)
Analog input channel specification register (ADS0)
(1) Successive approximation register (SAR)
This register compares the analog input voltage value to the voltage tap (compare value) value applied from the
series resistor string, and holds the result from the most significant bit (MSB).
When up to the least significant bit (LSB) is held (end of A/D conversion), the SAR contents are transferred to
the A/D conversion result register (ADCR0).
(2) A/D conversion result register (ADCR0)
The ADCR0 is an 8-bit register that stores the A/D conversion result. Each time A/D conversion ends, the
conversion result is loaded from the successive approximation register.
ADCR0 is read by an 8-bit memory manipulation instruction.
RESET input sets ADCR0 to 00H.
Caution
When writing is performed to the A/D converter mode register (ADM0) and analog input
channel specification register (ADS0), the contents of ADCR0 may become undefined. Read
the conversion result following conversion completion before writing to ADM0, ADS0. Using
a timing other than the above may cause an incorrect conversion result to be read.
(3) Sample & hold circuit
The sample & hold circuit samples each analog input signal sequentially applied from the input circuit, and sends
it to the voltage comparator. This circuit holds the sampled analog input voltage value during A/D conversion.
(4) Voltage comparator
The voltage comparator compares the analog input to the series resistor string output voltage.
(5) Series resistor string
The series resistor string is connected between AV
REF
and AV
SS
, and generates a voltage to be compared to
the analog input.
Содержание mPD780065 Series
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