R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 311

• Manufacturer Part Number: R0K572011S000BE
• Description: KIT STARTER FOR SH7201
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572011S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7201
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SH7201 Group
9.6
9.6.1
When writing to the external address space or making SDRAM settings in power-on reset
exception handling or cancellation of deep standby mode, be sure to set bits ACOSW[3:0] in
ACSWR to B'0011 beforehand.
9.6.2
In write access to normal or SDRAM space, the write data are stored once in the internal write
buffer of the BSC, and only after that does actual writing to the device (external device) connected
in the normal or SDRAM space proceed. Since writing from the write buffer to the external device
is performed automatically, no processing by software is necessary.
However, care must be taken on the following point. Write access from the CPU or DMAC
appears complete at the point where the data are stored in the above write buffer. That is, at the
point where the write access from the CPU or DMA controller has been completed, writing to the
external device might not have been completed. To confirm the completion of writing to the
external device, dummy read the normal or SDRAM space. Completion of the dummy-read
operation guarantees the completion of writing to the external device in response to previous write
access. The target address for the dummy read operation does not have to be in the same device as
the target for write access. Furthermore, it does not have to be in the same space.
9.6.3
When a transition to software standby mode or deep standby mode is made after write access to
the normal or SDRAM space, there is a possibility that data remains in the internal write buffer of
the BSC. To confirm that no data remain in the write buffer, execute a dummy read of the external
device in the same way as described above.
R01UH0026EJ0300 Rev. 3.00
Sep 24, 2010
Usage Note
Note on Power-on Reset Exception Handling and Deep Standby Mode Cancellation
Write Buffer
Note on Transition to Software Standby Mode or Deep Standby Mode
Section 9 Bus State Controller (BSC)
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