SH7616 Datasheet, PDF (284/935 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series

Section 7 Bus State Controller (BSC)
Bit 11—Area 0 Burst ROM Enable (BSTROM)
Bit 11: BSTROM
0
1
Description
Area 0 is accessed normally
Area 0 is accessed as burst ROM
(Initial value)
Bit 10—Reserved: This bit is always read as 0. The write value should always be 0.
Bits 9 and 8—Long Wait Specification for Areas 2 and 3 (AHLW1, AHLW0): When the basic
memory interface setting is made for CS2 and CS3, from 3 to 14 wait cycles are inserted in CS2 or
CS3 accesses when the bits specifying the respective area waits in the wait control bits (W21,
W20 or W31, W30) in wait control register 1 (WCR1) are set as long waits (i.e., are set to 11) (see
table 7.4).
Bits 7 and 6—Long Wait Specification for Area 1 (A1LW1, A1LW0): From 3 to 14 wait cycles
are inserted in area 1 accesses when the wait control bits (W11, W10) in wait control register 1
(WCR1) are set as long wait (i.e., are set to 11) (see table 7.4).
Bits 5 and 4—Long Wait Specification for Area 0 (A0LW1, A0LW0): When the basic memory
interface setting is made for CS0, from 3 to 14 wait cycles are inserted in CS0 accesses when the
wait control bits (W01, W00) in wait control register 1 (WCR1) are set as long wait (i.e., are set to
11) (see table 7.4).
Bit 3—Endian Specification for Area 4 (A4ENDIAN): In big-endian mode, the most significant
byte (MSB) is the lowest byte address, and byte data is aligned in order toward the least significant
byte (LSB). In little-endian mode, the LSB is the lowest byte address, and byte data is aligned in
order toward the MSB. When this bit is set to 1, data in read/write accesses to the CS4 space is
rearranged into little endian order before being transferred. This is used for data exchange with a
little-endian processor or when executing a program written with awareness of little-endian mode.
Bit 3: A4ENDIAN
0
1
Description
Big endian
Little endian
(Initial value)
Rev. 2.00 Mar 09, 2006 page 258 of 906
REJ09B0292-0200