H8S2245 datasheet(185/818 Pages) RENESAS

185 / 818 page

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.

H8S2245 데이터시트(PDF) 185 Page - Renesas Technology Corp

H8S2245 데이터시트(HTML) 185 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL