Renesas SH7641 - Manual (Page 345)

Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 295 of 982
REJ09B0023-0400
Bit Bit Name
Initial
Value R/W Description
20 MPX 0 R/W MPX-IO Interface Address Wait
Specifies the address cycle insertion wait for MPX-IO
interface. This bit setting is valid only when area 5B is
specified as MPX-I/O.
0: Inserts no wait cycle
1: Inserts 1 wait cycle
BAS 0 R/W Byte-Selection SRAM Byte Access Selection
This bit setting is valid only when area 5B is specified
as byte-selection SRAM.
Specifies the
WEn and RD/WR signal timing when the
byte-selection SRAM interface is used.
0: Asserts the
WEn signal at the read timing and
asserts the RD/
WR signal during the write access
cycle.
1: Asserts the
WEn signal during the read access cycle
and asserts the RD/
WR signal at the write timing.
19
 0
R Reserved
This bit is always read as 0. The write value should
always be 0.
18
17
16
WW2
WW1
WW0
0
0
0
R/W
R/W
R/W
Number of Write Access Wait Cycles
Specify the number of cycles that are necessary for
write access.
000: The same cycles as WR[3:0] setting (number of
read access wait cycles)
001: No cycle
010: 1 cycle
011: 2 cycles
100: 3 cycles
101: 4 cycles
110: 5 cycles
111: 6 cycles
15 to 13
 All
0 R Reserved
These bits are always read as 0. The write value
should always be 0.