HD6417751RBP240V Datasheet, PDF (212/1226 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

4. Caches
• When OC index mode is off (CCR.OIX = 0)
H'7C00 0000 to H'7C00 0FFF (4 KB): Corresponds to RAM area 1
H'7C00 1000 to H'7C00 1FFF (4 KB): Corresponds to RAM area 1
H'7C00 2000 to H'7C00 2FFF (4 KB): Corresponds to RAM area 2
H'7C00 3000 to H'7C00 3FFF (4 KB): Corresponds to RAM area 2
H'7C00 4000 to H'7C00 4FFF (4 KB): Corresponds to RAM area 1
:
:
:
RAM areas 1 and 2 then repeat every 8 Kbytes up to H'7FFF FFFF.
Thus, to secure a continuous 8-Kbyte RAM area, the area from H'7C00 1000 to H'7C00 2FFF
can be used, for example.
• When OC index mode is on (CCR.OIX = 1)
H'7C00 0000 to H'7C00 0FFF (4 KB): Corresponds to RAM area 1
H'7C00 1000 to H'7C00 1FFF (4 KB): Corresponds to RAM area 1
H'7C00 2000 to H'7C00 2FFF (4 KB): Corresponds to RAM area 1
:
:
:
H'7DFF F000 to H'7DFF FFFF (4 KB): Corresponds to RAM area 1
H'7E00 0000 to H'7E00 0FFF (4 KB): Corresponds to RAM area 2
H'7E00 1000 to H'7E00 1FFF (4 KB): Corresponds to RAM area 2
:
:
:
H'7FFF F000 to H'7FFF FFFF (4 KB): Corresponds to RAM area 2
As the distinction between RAM areas 1 and 2 is indicated by address bit [25], the area from
H'7DFF F000 to H'7E00 0FFF should be used to secure a continuous 8-Kbyte RAM area.
An example of RAM use in the SH7751R is shown below.
• SH7751-compatible-mode (CCR.EMODE = 0)
H'7C00 0000 to H'7C00 1FFF (8 KB): Corresponds to RAM area (entries 256 to 511)
H'7C00 2000 to H'7C00 3FFF (8 KB): Corresponds to RAM area (entries 256 to 511)
:
:
:
A shadow of the RAM area occurs every 8 Kbytes up to H'7FFF FFFF.
• Cache-double-mode (CCR.EMODE = 1)
The 8 Kbytes of entries 256 to 511 in OC way 0 are used as RAM area 1, and the 8 Kbytes of
entries 256 to 511 in OC way 1 are used as RAM area 2.
H'7C00 0000 to H'7C00 1FFF (8 KB): Corresponds to RAM area 1
H'7C00 2000 to H'7C00 3FFF (8 KB): Corresponds to RAM area 2
Rev.4.00 Oct. 10, 2008 Page 112 of 1122
REJ09B0370-0400