R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 1427
R0K572030S000BE
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
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27.2
27.2.1
When the same page of the on-chip high-speed RAM is accessed from different buses
simultaneously, a conflict on the page occurs. Although each access is completed correctly, this
kind of conflict degrades the memory access speed. Therefore, it is advisable to provide software
measures to prevent such conflicts as far as possible. For example, no conflict will arise if
different pages are accessed by each bus.
27.2.2
Before disabling memory operation or write access to the on-chip high-speed RAM through the
RAME or RAMWE bit, be sure to read from any address and then write to the same address in
each page; otherwise, the last written data in each page may not be actually written to the RAM.
// For page 0
// For page 1
// For page 2
// For page 3
Usage Notes
Page Conflict
RAME and RAMWE Bits
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
#H'FFF80000,R0
@R0,R1
R1,@R0
#H'FFF84000,R0
@R0,R1
R1,@R0
#H'FFF88000,R0
@R0,R1
R1,@R0
#H'FFF8C000,R0
@R0,R1
R1,@R0
Figure 27.1 Examples of Read/Write
Rev. 3.00 Sep. 28, 2009 Page 1395 of 1650
Section 27 On-Chip RAM
REJ09B0313-0300
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