H8S2245 datasheet(185/818 Pages) RENESAS

tên linh kiện	H8S2245

Giải thích chi tiết về linh kiện	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

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Section 6 Bus Controller

Rev.3.00 Mar. 26, 2007 Page 143 of 772

REJ09B0355-0300

6.2.5

Bus Control Register L (BCRL)

BRLE

R/W

BREQOE

R/W

EAE

R/W

—

(R/W)

—

(R/W)

WAITE

R/W

ASS

R/W

—

(R/W)

Bit

Initial value

R/W

BCRL is an 8-bit readable/writable register that performs selection of the external bus release state

protocol, selection of the area partition unit and enabling or disabling of

WAIT pin input.

BCRL is initialized to H'3C by a power-on reset and in hardware standby mode. It is not

initialized by a manual reset or in software standby mode.

Bit 7—Bus Release Enable (BRLE): Enables or disables external bus release.

Bit 7

BRLE

Description

External bus release is disabled.

BREQ, BACK, and BREQO can be used as I/O ports.

(Initial value)

External bus release is enabled.

Bit 6—BREQO Pin Enable (BREQOE): Outputs a signal that requests the external bus master

to drop the bus request signal (

BREQ) in the external bus release state, when an internal bus

master performs an external space access.

Bit 6

BREQOE

Description

BREQO output disabled. BREQO can be used as I/O port.

(Initial value)

BREQO output enabled.

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