Section 38 A/D Converter
Rev. 1.00 Oct. 01, 2007 Page 1666 of 1956
REJ09B0256-0100
38.4.3
Scan Mode (MDS1 = 1, MDS0 = 1)
In scan mode, A/D conversion is continuously repeated for the selected channels until the ADST
bit (bit 13) is cleared to 0. The A/D conversion results are transferred for storage to the ADDR that
corresponds to the channel. This mode is suitable for systems that continuously monitor analog
inputs to multiple channels (or a single channel). A/D conversion starts with the first channel
(AN0) when the ADST bit of the A/D control/status register (ADCSR) is set to 1 by software.
When multiple channels are selected, after A/D conversion for channel n ends, A/D conversion for
channel (n + 1) starts immediately.
A/D conversion is continuously repeated for the selected channels until the ADST bit is cleared to
0. The conversion results are transferred for storage to the ADDR that corresponds to the channel.
When setting the A/D control/status register (ADCSR) or switching the analog input channel
during A/D conversion, first clear the ADST bit to 0 to halt A/D conversion in order to avoid
malfunction. After the change has been made, setting the ADST bit to 1 selects the first channel
and A/D conversion is resumed.
Typical operations when three channels (AN0 to AN2) are selected in scan mode are described
below. Figure 38.4 shows a timing diagram for this example.
1. Select scan mode as the operating mode (MDS[1:0] = 11) and AN0 to AN2 as the input
channels (CH[2:0] = 010). Then start A/D conversion (ADST = 1).
2. A/D conversion of the first channel (AN0) starts. When A/D conversion ends, the result is
transferred into ADDRA. Next, the second channel (AN1) is selected automatically and A/D
conversion starts.
3. A/D conversion proceeds in the same way up to the third channel (AN2).
4. When A/D conversion of all selected channels (AN0 to AN2) is completed, the ADF bit is set
to 1, the first channel (AN0) is selected again, and A/D conversion is consecutively performed.
(In multi mode, A/D conversion ends when the selected channels have been cycled through.
However, in scan mode, after the selected channels have been cycled through, A/D conversion
starts again from the first channel and is consecutively repeated.)
If the ADIE bit is set to 1 at this time, an ADI interrupt is generated after A/D conversion ends.
5. While the ADST bit is set to 1, steps 2 to 4 above are repeated.
When the ADST bit is 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 (AN0).
Содержание SH7763
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Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
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Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
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Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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