Section 7 Memory Management Unit (MMU)
Rev.1.00 Dec. 13, 2005 Page 194 of 1286
REJ09B0158-0100
7.7.6
Notes on Using 32-Bit Address Extended Mode
When using 32-bit address extended mode, note that the items described in this section are
extended or changed as follows.
PASCR: The SE bit is added in bit 31 in the control register (PASCR). The bits 6 to 0 of the UB
in the PASCR are invalid (Note that the bit 7 of the UB is still valid). When writing to the P1 or
P2 area, the UB bit in the PMB controls whether a buffered write is performed or not. When the
MMU is enabled, the UB bit in the TLB controls writing to the P0, P3, or U0 area. When the
MMU is disabled, writing to the P0, P3, or U0 area is always performed as a buffered write.
Bit Bit
Name
Initial
Value R/W Description
31
SE
0
R/W
0: 29-bit address mode
1: 32-bit address extended mode
30 to 8
All
0
R
Reserved
For details on reading from or writing to these bits,
see description in General Precautions on Handling
of Product.
7 to 0
UB
All 0
R/W
Buffered Write Control for Each Area (64 Mbytes)
When writing is performed without using the cache or
in the cache write-through mode, these bits specify
whether the CPU waits for the end of writing for each
area.
0: The CPU does not wait for the end of writing
1: The CPU stalls and waits for the end of writing
UB[7]: Corresponding to the control register area
UB[6:0]: These bits are invalid in 32-bit address
extended mode.
Содержание SH7780 Series
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