Fujitsu FR81S User Manual
CHAPTER 44: 12-BIT A/D CONVERTER
2. Features
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: 12-BIT A/D CONVERTER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
8
2.3. Functions of 12-bit A/D Converter Control
The function of 12-bit A/D converter control is explained.
There are 12-bit A/D converters 0 to 1, to which analog input pins are assigned. Please refer to "Table
2-1 Channel allocation of each unit" for the correspondence of each input pin and the unit.
A function used to A/D-convert analog voltages (input voltages) input to the analog input pins to digital
values is provided. Its features are as follows:
The conversion time is at least 1.0 μs (including sampling time).
The conversion method is the RC successive approximation conversion method with a sample hold
circuit.
The analog input pins can be selected under program control. (This program is configured in the A/D
activation compare section)
Activation signals are entered as pulse signals.
One sequence of A/D conversion is performed for one activation factor.
If an activation signal is entered again during A/D conversion, reactivation is performed. (Reactivation
function)
If an A/D conversion cancel signal is received during A/D conversion, the current processing is stopped
and the converter is initialized. (Forced stop function)
As for the setting of the sampling time, a common sampling time setting to all channels and the sampling
time settings of each channel can be selected.
MB91520 Series
MN705-00010-1v0-E
1811