SH7670 Datasheet, PDF (201/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 7 Bus State Controller (BSC)
Internal Address
Space Memory to be Connected
Cache
H'80000000 to H'FFFBFFFF Other On-chip RAM, reserved area*

H'FFFC0000 to H'FFFFFFFF Other On-chip peripheral modules, reserved area*

Note: * For the on-chip RAM space, access the addresses shown in section 27, On-Chip RAM.
For the on-chip peripheral module space, access the addresses shown in section 28,
List of Registers. Do not access addresses which are not described in these sections.
Otherwise, the correct operation cannot be guaranteed.
7.3.2 Data Bus Width and Pin Function Setting in Each Area
In this LSI, the data bus width of area 0 and the initial data bus width of areas 3 to 6 can be set to
8, or 16 bits through external pins during a power-on reset. The bus width of area 0 cannot be
modified after a power-on reset. The initial data bus width of areas 3 to 6 is set to the same size as
that of area 0, but can be modified to 8, 16, or 32 bits through register settings during program
execution. Note that the selectable data bus widths may be limited depending on the connected
memory type.
After a power-on reset, the LSI starts execution of the program stored in the external memory
allocated in area 0. Since ROM is assumed as the external memory in area 0, minimum pin
functions such as the address bus, data bus, CS0, and RD are available. The sample access
waveforms shown in this section include other pins such as BS, RD/WR, and WEn, which are
available after they are selected through the pin function controller. Do not attempt any form of
memory access other than reading of area 0 until the pin function settings have been completed by
the program.
For details on pin function settings, see section 23, Pin Function Controller (PFC).
Table 7.3 Correspondence between External Pin (MD) and Data Bus Width
MD_BW
1
0
Data Bus Width
8 bits
16 bits
Rev. 1.00 Nov. 14, 2007 Page 175 of 1262
REJ09B0437-0100