
MB90495G Series
52
10. 8/10-bit A/D Converter
The 8/10-bit A/D converter converts analog voltage to 8 or 10-bit digital values, by means of RC successive
approximation conversion.
The input signal can be selected from an 8-channel analog input pin set.
Select a software trigger, internal timer output, or external trigger as the start trigger.
Functions of the 8/10 A/D Converter
Converts analog voltage (input voltage) input to the analog input pins to 8-bit or 10-bit digital values. (A/D
conversion)
The 8/10-bit A/D converter has the following features :
Single-channel A/D conversion time is a minimum of 6.12
μ
s, including sampling time.*
Single-channel sampling time is a minimum of 2.0
μ
s.*
RC-type successive approximation with sampling and hold circuits is used for conversion.
Select 8 or 10-bit resolution.
Analog input pins can use up to 8 channels.
A/D conversion results are stored in the A/D data register, allowing them to be used to generate interrupts.
Interrupt requests launch the EI
2
OS. Use the EI
2
OS to prevent dropped data even with continuous A/D con-
version.
Select software, internal timer output, or external trigger (falling edge) as the start trigger.
* : With machine clock operating at 16 MHz
Conversion Modes of the 8
/
10
-
bit A
/
D Converter
Conversion Mode
Description
Single conversion mode
Conducts A/D conversion for each channel in turn, from the start channel to the end
channel. When A/D conversion of the end channel is completed, the A/D conversion
function halts.
Continuous conversion
mode
Conducts A/D conversion for each channel in turn, from the start channel to the end
channel. When A/D conversion of the end channel is completed, the function returns
to the start channel and continues A/D conversion.
Stop conversion mode
Suspends each channel and conducts A/D conversion, one at a time. When A/D
conversion of the end channel is completed, the function returns to the start channel
and repeats the A/D conversion and channel stop.