Hitachi SH7709S, Hardware Manual

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Bit 0—Area 6 Bus Type (A6PCM): Designates whether to access physical space area 6 as
PCMCIA space.
Bit 0: A6PCM Description
0 Physical space area 6 accessed as ordinary memory (Initial value)
1 Physical space area 6 accessed as PCMCIA space
10.2.2 Bus Control Register 2 (BCR2)
Bus control register 2 (BCR2) is a 16-bit readable/writable register that selects the bus size of each
area and whether an 8-bit port is used or not. It is initialized to H'3FF0 by a power-on reset, but is
not initialized by a manual reset or in standby mode. Do not access external memory outside area
0 until BCR2 register initialization is complete.
Bit: 15 14 13 12 11 10 9 8
— — A6SZ1 A6SZ0 A5SZ1 A5SZ0 A4SZ1 A4SZ0
Initial value: 0 0 1 1 1 1 1 1
R/W: R R R/W R/W R/W R/W R/W R/W
Bit: 7 6 5 4 3 2 1 0
A3SZ1 A3SZ0 A2SZ1 A2SZ0 — — — —
Initial value: 1 1 1 1 0 0 0 0
R/W: R/W R/W R/W R/W R R R R
Bits 15, 14, 3, 2, 1, and 0—Reserved: These bits are always read as 0. The write value should
always be 0.
Bits 2n + 1, 2n—Area n (2–6) Bus Size Specification (AnSZ1, AnSZ0): Specify the bus size of
physical space area n (n
=
2 to 6).