SH7052 datasheet(148/919 Pages) RENESAS

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8.2

Description of Registers

8.2.1

Bus Control Register 1 (BCR1)

Bit:

———

——

—

Initial value:

R/W:

Bit:

—

A3SZ

A2SZ

A1SZ

A0SZ

Initial value:

R/W:

R/W

BCR1 is a 16-bit readable/writable register that specifies the bus size of the CS spaces.

Write bits 15 to 0 of BCR1 during the initialization stage after a power-on reset, and do not

change the values thereafter. In on-chip ROM enabled mode, do not access any of the CS spaces

until after completion of register initialization. In on-chip ROM disabled mode, do not access any

CS space other than CS0 until after completion of register initialization.

BCR1 is initialized to H'000F by a power-on reset and in hardware standby mode. It is not

initialized by a manual reset or in software standby mode.

• Bits 15 to 4—Reserved: These bits always read 0. Operation cannot be guaranteed if 1 is

written to these bits.

• Bit 3—CS3 Space Size Specification (A3SZ): Specifies the CS3 space bus size. A 0 setting

specifies byte (8-bit) size, and a 1 setting specifies word (16-bit) size.

Bit 3: A3SZ

Description

Byte (8-bit) size

Word (16-bit) size

(Initial value)

• Bit 2—CS2 Space Size Specification (A2SZ): Specifies the CS2 space bus size. A 0 setting

specifies byte (8-bit) size, and a 1 setting specifies word (16-bit) size.

Bit 2: A2SZ

Description

Byte (8-bit) size

Word (16-bit) size

(Initial value)

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