SH7641 Datasheet, PDF (351/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 12 Bus State Controller (BSC)
Initial
Bit
Bit Name Value R/W Description
1
HW1
0
R/W Number of Delay Cycles from RD, WEn Negation to
0
HW0
0
R/W ^{Address, CSn Negation}
Specify the number of delay cycles from RD, WEn
negation to address, and CSn negation.
00: 0.5 cycles
01: 1.5 cycles
10: 2.5 cycles
11: 3.5 cycles
Burst ROM (Clock Asynchronous):
• CS0WCR
Bit
Bit Name
31 to 21 
20
BEN
19, 18 
Initial
Value
All 0
0
All 0
R/W Description
R
Reserved
These bits are always read as 0. The write value
should always be 0.
R/W Burst Enable Specification
Enables or disables 8-burst access for a 16-bit bus
width or 16-burst access for an 8-bit bus width during
16-byte access. If this bit is set to 0, 2-burst access is
performed four times when the bus width is 16 bits and
4-burst access is performed four times when the bus
width is 8 bits. To use a device that does not support
8-burst access or 16-burst access, set this bit to 1.
0: Enables 8-burst access for a 16-bit bus width and
16-burst access for an 8-bit bus width.
1: Disables 8-burst access for a 16-bit bus width and
16-burst access for an 8-bit bus width.
R
Reserved
These bits are always read as 0. The write value
should always be 0.
Rev. 4.00 Sep. 14, 2005 Page 301 of 982
REJ09B0023-0400