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14.4
Operation
The A/D converter operates by successive approximation with 10-bit resolution. It has two
operating modes; single mode and scan mode. When changing the operating mode or analog input
channel, in order to prevent incorrect operation, first clear the bit ADST to 0 in ADCSR. The
ADST bit can be set at the same time as the operating mode or analog input channel is changed.
14.4.1
Single Mode
In single mode, A/D conversion is performed once for the analog input on the specified single
channel as follows:
1.
A/D conversion is started from the first channel when the ADST bit in ADCSR is set to 1,
according to software or external trigger input.
2.
When A/D conversion is completed, the result is transferred to the corresponding A/D data
register to the channel.
3.
On completion of conversion, the ADF bit in ADCSR is set to 1. If the ADIE bit is set to 1 at
this time, an ADI interrupt request is generated.
4.
The ADST bit remains set to 1 during A/D conversion. When A/D conversion ends, the
ADST bit is automatically cleared to 0 and the A/D converter enters the wait state.
14.4.2
Scan Mode
In scan mode, A/D conversion is performed sequentially for the analog input on the specified
channels (four channels maximum) as follows:
1. When the ADST bit is set to 1 by software, or external trigger input, A/D conversion starts on
the first channel in the group.
2. When A/D conversion for each channel is completed, the result is sequentially transferred to
the A/D data register corresponding to each channel.
3. When conversion of all the selected channels is completed, the ADF flag in ADCSR is set to 1.
If the ADIE bit is set to 1 at this time, an ADI interrupt is requested after A/D conversion ends.
Conversion of the first channel in the group starts again.
4. Steps [2] to [3] are repeated as long as the ADST bit remains set to 1. When the ADST bit is
cleared to 0, A/D conversion stops and the A/D converter enters the wait state.
Rev. 1.0, 03/01, page 199 of 280
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