R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 278
R0K572011S000BE
Manufacturer Part Number
R0K572011S000BE
Description
KIT STARTER FOR SH7201
Manufacturer
Renesas Electronics America
Series
Renesas Starter Kits (RSK)r
Type
MCUr
Datasheets
1.R0K572011S000BE.pdf
(1222 pages)
2.R0K572011S000BE.pdf
(7 pages)
3.R0K572011S000BE.pdf
(5 pages)
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
- Current page: 278 of 1222
- Download datasheet (8Mb)
Section 9 Bus State Controller (BSC)
(5)
An auto-refresh cycle starts when the auto-refresh operation enable bit (DRFEN) in SDRAM
refresh control register 1 (SDRFCNT1) is set to 1. After that refresh requests are issued at fixed
intervals, activating auto-refresh cycles. However, the activation of auto-refresh cycles may
sometimes be delayed because refresh requests are not accepted during read or write accesses.
A refresh request is issued immediately if the auto-refresh operation enable bit (DRFEN) in
SDRAM refresh control register 1 (SDRFCNT1) is set to 1 while auto-refresh is enabled.
The refresh counter is halted in self-refresh or deep-power-down mode. After recovery from self-
refresh or deep-power-down mode an auto-refresh cycle is activated, after which the counter value
is reset and the counter begins operating again
Make auto-refresh settings in SDRAM refresh control register 1 (SDRFCNT1). Note that refresh
cycles affect all SDRAM channels. Figure 9.9 shows an auto-refresh cycle timing example.
Page 250 of 1190
Auto-Refresh
CKIO
SDRAM command
Figure 9.9 Auto-Refresh Cycle Timing Example (DREFW Bit Set Value: 0010)
Figure 9.8 Example of Timing of Recovery from Self-Refresh Mode
DSL: Deselect command
RFA: Auto-refresh command
RFX: Self-refresh exit command
Self-refresh mode
CKIO
SDRAM command
(CKE = L)
(DREFW Bit Set Value: 0010)
DSL: Deselect command
RFA: Auto-refresh command
Self-refresh clearing
REX
Auto-refresh cycle
RFA
interval
DREFW
DSL
DREFW
DSL
DSL
DSL
RFA
Auto-refresh
cycle
DREFW
DSL
R01UH0026EJ0300 Rev. 3.00
DSL
SH7201 Group
Sep 24, 2010
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