r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 992

• Manufacturer Part Number: r5s72060w200fpv
• Description: 32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
• Manufacturer: Renesas Electronics Corporation.

Section 21 On-Chip RAM
21.2
21.2.1
When the same page 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.
21.2.2
Before disabling memory operation or write access 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.
Rev. 2.00 Dec. 09, 2005 Page 968 of 1152
REJ09B0191-0200
// 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
Figure 21.1 Examples of Read/Write before Disabling RAM
#H'FFF80000,R0
@R0,R1
R1,@R0
#H'FFF88000,R0
@R0,R1
R1,@R0
#H'FFF90000,R0
@R0,R1
R1,@R0
#H'FFF98000,R0
@R0,R1
R1,@R0