SH7708 datasheet(221/633 Pages) RENESAS

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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

Access physical space area 6 as normal memory.

(Initial value)

Access physical space area 6 as PCMCIA space.*

Note:

MD4 pin output is

CE2B.

10.2.2

Bus Control Register 2 (BCR2)

Bus control register 2 (BCR2) is a 16-bit read/write register that selects the bus size of each area,

and whether to use the 8-bit port. It is initialized to H'3FFC 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:

Bit name:

—

A6SZ1

A6SZ0

A5SZ1

A5SZ0

A4SZ1

A4SZ0

Initial value:

R/W:

R/W

Bit:

Bit name:

A3SZ1

A3SZ0

A2SZ1

A2SZ0

A1SZ1

A1SZ0

—

PORTEN

Initial value:

R/W:

R/W

—

R/W

Bits 15, 14, and 1—Reserved: These bits always read 0. The write value should always be 0.

Bits 2n + 1, 2n—Area n (1–6) Bus Size Specification (AnSZ1, AnSZ0): These bits specify the bus

sizes of physical space area n (n = 1 to 6).

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