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Section 6 Bus Controller (BSC)
Table 6.5
Areas Specifiable for Each Interface
Interface
Basic interface
Byte control SRAM interface
Burst ROM interface
Address/data multiplexed I/O
interface
(2)
Bus Width
A bus width of 8 or 16 bits can be selected with ABWCR. An area for which an 8-bit bus is
selected functions as an 8-bit access space and an area for which a 16-bit bus is selected functions
as a 16-bit access space. In addition, the bus width of address/data multiplexed I/O space is 8 bits
or 16 bits, and the bus width for the byte control SRAM space is 16 bits.
The initial state of the bus width is specified by the operating mode.
If all areas are designated as 8-bit access space, 8-bit bus mode is set; if any area is designated as
16-bit access space, 16-bit bus mode is set.
(3)
Endian Format
Though the endian format of this LSI is big endian, data can be converted into little endian format
when reading or writing to the external address space.
Areas 7 to 2 can be specified as either big endian or little endian format by the LE7 to LE2 bits in
ENDIANCR.
The initial state of each area is the big endian format.
Note that the data format for the areas used as a program area or a stack area should be big endian.
Rev.2.00 Jun. 28, 2007 Page 156 of 666
REJ09B0311-0200
Related
Registers
0
SRAMCR
O
O
BROMCR
O
MPXCR
Areas
1
2
3
4
O
O
O
O
O
O
O
O
O
O
O
5
6
7
O
O
O
O
O
O
O
O
O
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