Renesas SuperH SH-4A, Руководство пользователя программного обеспечения

Страница: 148 / 472

Rev. 1.50, 10/04, page 128 of 448
7.2.6 Physical Address Space Control Register (PASCR)
PASCR controls the operation in the physical address space.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Bit:
0 0 0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0 0 0
Initial value:
R R R R R R R R R R R R R R R R
R/W
UB
R/W R/W R/W R/W R/W R/W R/W
R/W:
Bit:
Initial value:
R/W:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0 0
R R R R R R R R
Bit Bit Name
Initial
Value R/W
Description
31 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 next bus access from the CPU waits for the
end of writing for each area.
0 : The CPU does not wait for the end of writing bus
access and starts the next bus access
1 : The CPU waits for the end of writing bus access and
starts the next bus access
UB[7]: Corresponding to the control register area
UB[6]: Corresponding to area 6
UB[5]: Corresponding to area 5
UB[4]: Corresponding to area 4
UB[3]: Corresponding to area 3
UB[2]: Corresponding to area 2
UB[1]: Corresponding to area 1
UB[0]: Corresponding to area 0