Section 23 A/D Converter
Rev. 1.00 Mar. 12, 2008 Page 902 of 1178
REJ09B0403-0100
23.4 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, to prevent incorrect operation, first clear the ADST bit to 0 in ADCSR to halt A/D
conversion. The ADST bit can be set to 1 at the same time as the operating mode or analog input
channel is changed.
23.4.1 Single
Mode
In single mode, A/D conversion is performed only once on the specified single channel.
Operations are as follows.
1. A/D conversion on the specified channel is started when the ADST bit in ADCSR is set to 1,
by software or by the input of trigger signal.
2. When A/D conversion is completed, the result is transferred to the A/D data register
corresponding to the channel.
3. On completion of A/D 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 conversion ends, the ADST bit
is automatically cleared to 0, and the A/D converter enters the idle state. If the ADST bit is
cleared during A/D conversion, the A/D converter stops conversion and enters the idle state.
Содержание H8S Family
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