R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 291

• 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
(b)
Figure 9.27 shows the procedure for transitioning to and recovering from self-refresh mode.
Note: Before transitioning to or recovering from self-refresh mode it is necessary to halt
R01UH0026EJ0300 Rev. 3.00
Sep 24, 2010
Procedure for Transition to and Recovery from Self-Refresh Mode
Figure 9.27 Procedure for Transition to and Recovery from Self-Refresh Mode
SDRAM access to the affected channels. Consequently, it is not possible to transition to or
recover from self-refresh mode while programs or DMA operations that access SDRAM
are in progress. Pay attention to the following points when writing programs.
• Before transitioning to self-refresh mode, halt any DMA channel transfers that access
• Make sure that programs run while transitioning to self-refresh mode, while in self-
the SDRAM area of the affected channels.
refresh mode, or while recovering from self-refresh mode do not access operands or
fetch (or pre-fetch) instructions stored in the SDRAM area.
Access enabled status
(DRFEN = 1, EXENB = 1)
Initialization sequence
(1) Halt any DMA access to SDRAM area
(2) Halt access to all SDRAMC channels (EXENB = 0) by means of program
(3) Confirm that EXENB has been cleared to 0
Start self-refresh
(1) Confirm that all status bits in SDSTR have been cleared to 0
(2) Set DSFEN bit to 1 by means of program assigned to other than SDRAM area
End self-refresh
(1) Confirm that all status bits in SDSTR have been cleared to 0
(2) Clear DSFEN bit to 0 by means of program assigned to other than SDRAM
Enable access
Enable access to SDRAMC (EXENB = 1) by means of program assigned to other
than SDRAM area
Access enabled status
(DRFEN = 1, EXENB = 1)
assigned to other than SDRAM area
area
Self-refresh mode
Section 9 Bus State Controller (BSC)
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