Section 7 Bus State Controller (BSC)
Rev. 2.00 Mar 09, 2006 page 257 of 906
REJ09B0292-0200
7.2
Register Descriptions
7.2.1
Bus Control Register 1 (BCR1)
Bit:
15
14
13
12
11
10
9
8
—
A4LW1 A4LW0
A2EN
DIAN
BST
ROM
—
AHLW1 AHLW0
Initial value:
0
0
0
0
0
0
1
1
R/W:
R
R/W
R/W
R/W
R/W
R
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
A1LW1 A1LW0 A0LW1 A0LW0
A4EN
DIAN
DRAM2 DRAM1 DRAM0
Initial value:
1
1
1
1
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initialize the ENDIAN, BSTROM, PSHR, and DRAM2–DRAM0 bits after a power-on reset, and
do not change their values thereafter. To change other bits by writing to them, write the same
value as they are initialized to. Do not access any space other than CS0 until the register
initialization ends.
Bit 15—Reserved: This bit is always read as 0. The write value should always be 0.
Bits 14 and 13—Long Wait Specification for Area 4 (A4LW1, A4LW0): From 3 to 14 wait cycles
are inserted in CS4 space accesses when the wait control bits (W41, W40) in wait control register
2 (WCR2) are set as long wait (i.e., are set to 11) (see table 7.4).
Bit 12—Endian Specification for Area 2 (A2ENDIAN): In big-endian format, the MSB of byte
data is the lowest byte address and byte data goes in order toward the LSB
.
For little-endian
format, the LSB of byte data is the lowest byte address and byte data goes in order toward the
MSB
.
When this bit is 1, the data is rearranged into little-endian format before transfer when the
CS2 space is read or written to. It is used when handling data with little-endian processors or
running programs written with conscious use of little-endian format.
Bit 12: A2ENDIAN
Description
0
Big-endian
(Initial value)
1
Little-endian
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...