R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 1427

• 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

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