HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 187
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HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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6.2.5
Note: * This bit is reserved in the H8S/2321.
BCRL is an 8-bit readable/writable register that performs selection of the external bus-released
state protocol, DMAC single address transfer, enabling or disabling of the write data buffer
function, and enabling or disabling of WAIT pin input.
BCRL is initialized to H'3C by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 7—Bus Release Enable (BRLE): Enables or disables external bus release.
Bit 7
BRLE
0
1
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, or when a refresh request is generated.
Bit 6
BREQOE
0
1
Bit
Initial value :
R/W
Bus Control Register L (BCRL)
Description
External bus release is disabled. BREQ, BACK, and BREQO pins can be used as I/O
ports
External bus release is enabled
Description
BREQO output disabled. BREQO pin can be used as I/O port
BREQO output enabled
:
:
BRLE
R/W
7
0
BREQOE
R/W
6
0
EAE
R/W
5
1
R/W
—
4
1
Rev.6.00 Sep. 27, 2007 Page 157 of 1268
DDS *
R/W
3
1
R/W
—
2
1
Section 6 Bus Controller
WDBE *
REJ09B0220-0600
R/W
1
0
(Initial value)
(Initial value)
WAITE
R/W
0
0
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