SH7751 Datasheet, PDF (456/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

13. Bus State Controller (BSC)
Bits 2n + 1, 2n—Area n (1 to 6) Bus Width Specification (AnSZ1, AnSZ0): These bits specify
the bus width of area n (n = 1 to 6).
(Bit 0): PORTEN Bit 2n + 1: AnSZ1
0
0
1
1
0
1
Bit 2n: AnSZ0
0
1
0
1
0
1
0
1
Description
Reserved (Setting prohibited)
Bus width is 8 bits
Bus width is 16 bits
Bus width is 32 bits
(Initial value)
Reserved (Setting prohibited)
Bus width is 8 bits
Bus width is 16 bits
Bus width is 32 bits
Bit 1—Reserved: This bit is always read as 0, and should only be written with 0.
Bit 0—Port Function Enable (PORTEN): Specifies whether pins AD31 to AD0 are used as a
32-bit port. However, select PCI-disable mode when using this function.
Bit 0: PORTEN
0
1
Description
AD31 to AD0 are not used as a port
AD31 to AD0 are used as a port
(Initial value)
Rev.4.00 Oct. 10, 2008 Page 358 of 1122
REJ09B0370-0400