Hitachi SH7750 Hardware Manual page 386

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 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 D51 to D32 are used as a 20-
bit port. When this function is used, a bus width of 8, 16, or 32 bits should be set for all areas.
Bit 0: PORTEN
0
1
Rev. 6.0, 07/02, page 336 of 986
Bit 2n: AnSZ0
0
1
0
1
0
1
0
1
Description
D51 to D32 are not used as a port
D51 to D32 are used as a port
Description
Bus width is 64 bits
Bus width is 8 bits
Bus width is 16 bits
Bus width is 32 bits
Reserved (Setting prohibited)
Bus width is 8 bits
Bus width is 16 bits
Bus width is 32 bits
(Initial value)
(Initial value)