HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 467
HD6413008F
Manufacturer Part Number
HD6413008F
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413008F.pdf
(686 pages)
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14.4.2
Scan mode is useful for monitoring analog inputs in a group of one or more channels. 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 (AN
selected, after conversion of the first channel ends, conversion of the second channel (AN
starts immediately. A/D conversion continues cyclically on the selected channels until the ADST
bit is cleared to 0. The conversion results are transferred for storage into the A/D data registers
corresponding to the channels.
When the mode or analog input channel selection 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. A/D conversion will start again from the
first channel in the group. The ADST bit can be set at the same time as the mode or channel
selection is changed.
Typical operations when three channels in group 0 (AN
described next. Figure 14.4 shows a timing diagram for this example.
1. Scan mode is selected (SCAN = 1), scan group 0 is selected (CH2 = 0), analog input channels
2. When A/D conversion of the first channel (AN
3. Conversion proceeds in the same way through the third channel (AN
4. When conversion of all selected channels (AN
5. Steps 2 to 4 are repeated as long as the ADST bit remains set to 1. When the ADST bit is
AN
ADDRA. Next, conversion of the second channel (AN
and conversion of the first channel (AN
interrupt is requested when A/D conversion ends.
cleared to 0, A/D conversion stops. After that, if the ADST bit is set to 1, A/D conversion
starts again from the first channel (AN
0
to AN
Scan Mode (SCAN = 1)
2
are selected (CH1 = 1, CH0 = 0), and A/D conversion is started (ADST = 1).
0
when CH2 = 0, AN
0
).
0
) starts again. If the ADIE bit is set to 1, an ADI
4
when CH2 = 1). When two or more channels are
0
0
) is completed, the result is transferred into
to AN
0
to AN
Rev.4.00 Aug. 20, 2007 Page 423 of 638
2
1
) is completed, the ADF flag is set to 1
) starts automatically.
2
) are selected in scan mode are
2
).
14. A/D Converter
REJ09B0395-0400
1
or AN
5
)
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