H8S2116 Datasheet, PDF (616/842 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2100 Series

Section 17 A/D Converter
17.4 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 in ADCSR to 0 to halt A/D
conversion. The ADST bit can be set at the same time the operating mode or analog input channel
is changed.
17.4.1 Single Mode
In single mode, A/D conversion is to be 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 an external trigger input.
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 wait state. When the ADST bit is
cleared to 0 during A/D conversion, the conversion stops and the A/D converter enters wait
state.
Rev. 1.00 Mar. 02, 2006 Page 576 of 798
REJ09B0255-0100