HD64F2149 Datasheet, PDF (674/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

20.4 Operation
The A/D converter operates by successive approximations with 10-bit resolution. It has two
operating modes: single mode and scan mode.
20.4.1 Single Mode (SCAN = 0)
Single mode is selected when A/D conversion is to be performed on a single channel only. A/D
conversion is started when the ADST bit is set to 1 by software, or by external trigger input. The
ADST bit remains set to 1 during A/D conversion, and is automatically cleared to 0 when
conversion ends.
On completion of conversion, the ADF flag is set to 1. If the ADIE bit is set to 1 at this time, an
ADI interrupt request is generated. The ADF flag is cleared by writing 0 after reading ADCSR.
When the operating mode or analog input channel must be changed during analog conversion, to
prevent incorrect operation, first clear the ADST bit to 0 in ADCSR to halt A/D conversion. After
making the necessary changes, set the ADST bit to 1 to start A/D conversion again. The ADST bit
can be set at the same time as the operating mode or input channel is changed.
Typical operations when channel 1 (AN1) is selected in single mode are described next. Figure
20.3 shows a timing diagram for this example.
1. Single mode is selected (SCAN = 0), input channel AN1 is selected (CH1 = 0, CH0 = 1), the
A/D interrupt is enabled (ADIE = 1), and A/D conversion is started (ADST = 1).
2. When A/D conversion is completed, the result is transferred to ADDRB. At the same time the
ADF flag is set to 1, the ADST bit is cleared to 0, and the A/D converter becomes idle.
3. Since ADF = 1 and ADIE = 1, an ADI interrupt is requested.
4. The A/D interrupt handling routine starts.
5. The routine reads ADCSR, then writes 0 to the ADF flag.
6. The routine reads and processes the conversion result (ADDRB).
7. Execution of the A/D interrupt handling routine ends. After that, if the ADST bit is set to 1,
A/D conversion starts again and steps 2 to 7 are repeated.
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