R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 1065

• Manufacturer Part Number: R0K572030S000BE
• Description: KIT DEV FOR SH7203
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572030S000BE

• Contents: CPU Board, LCD Module, E10A-Lite Emulator, Cable, QuickStart Guide and CD-ROM
• Silicon Manufacturer: Renesas
• Kit Contents: Board
• Silicon Family Name: SH7203
• Silicon Core Number: R5S72030W200FP
• Tool / Board Applications: General Purpose MCU, MPU, DSP, DSC
• Mcu Supported Families: SH7203
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: SH7203
• Lead Free Status / Rohs Status: Compliant

20.4.3
Scan mode is useful for monitoring analog inputs in a group of one or more channels at all times.
In scan mode, A/D conversion is performed sequentially for a maximum of eight specified analog
input channels, as follows:
1. A/D conversion starts from the analog input channel with the lowest number (e.g. AN0, AN1,
2. When A/D conversion is completed on each channel, the A/D conversion result is sequentially
3. After A/D conversion on all selected channels has completed, the ADF bit in ADCSR is set to
4. The ADST bit is not cleared automatically, so steps 2. and 3. are repeated as long as the ADST
When the operating mode or analog input channel selection must be changed during A/D
conversion, to prevent incorrect operation, first clear the ADST bit to 0 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 (AN0 to AN2) are selected in scan mode are described as
follows. Figure 20.4 shows a timing diagram for this example.
1. Scan mode is selected (MDS2 = 1, MDS1 = 1), analog input channels AN0 to AN2 are
2. A/D conversion of the first channel (AN0) starts. When A/D conversion is completed, the A/D
3. Next, the second channel (AN1) is selected automatically and A/D conversion starts.
4. Conversion proceeds in the same way through the third channel (AN2).
5. When conversion of all the selected channels (AN0 to AN2) is completed, the ADF flag is set
…, AN3) when the ADST bit in ADCSR is set to 1 by software, MTU2, or external trigger
input.
transferred to the A/D data register corresponding to that channel.
1. If the ADIE bit is set to 1 at this time, an ADI interrupt request is generated. The A/D
converter starts A/D conversion again from the channel with the lowest number.
bit remains set to 1. When the ADST bit is cleared to 0, A/D conversion halts and the A/D
converter becomes idle.
The ADF bit is cleared by reading ADF while ADF = 1, then writing 0 to the ADF bit.
selected (CH[2:0] = 010), and A/D conversion is started (ADST = 1).
conversion result is transferred into ADDRA.
to 1 and conversion of the first channel (AN0) starts again. If the ADIE bit is set to 1 at this
time, an ADI interrupt is requested.
Scan Mode
Rev. 3.00 Sep. 28, 2009 Page 1033 of 1650
Section 20 A/D Converter (ADC)
REJ09B0313-0300