h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 176

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 7 Bus Controller
7.2.5
BCRL is an 8-bit readable/writable register that performs selection of the external bus-released
state protocol, enabling or disabling of the write data buffer function, and enabling or disabling of
wait input by WAIT pin.
BCRL is initialized to H'08 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bits 7 and 6—Reserved: Only 0 should be written to these bits.
Bit 5—Reserved: It is always read as 0. Cannot be written to.
Bit 4—Reserved: Only 0 should be written to this bit.
Bit 3—Reserved: Only 1 should be written to this bit.
Bit 2—Reserved: Only 0 should be written to this bit.
Bit 1—Write Data Buffer Enable (WDBE): This bit selects whether or not to use the write
buffer function in the external write cycle.
Bit 0—WAIT Pin Enable (WAITE): Selects enabling or disabling of wait input by means of the
WAIT pin.
Rev. 5.00 Sep 22, 2005 page 150 of 1136
REJ09B0257-0500
Bit 1
WDBE
0
1
Bit 0
WAITE
0
1
Bit
Initial value
R/W
Bus Control Register L (BCRL)
Description
Write data buffer function not used
Write data buffer function used
Description
Wait input by WAIT pin disabled. WAIT pin can be used as I/O port.
Wait input by WAIT pin enabled
:
:
:
R/W
—
7
0
R/W
—
6
0
—
—
5
0
R/W
—
4
0
R/W
—
3
1
R/W
—
2
0
WDBE
R/W
1
0
(Initial value)
(Initial value)
WAITE
R/W
0
0