HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 154

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6. Bus Controller
6.2.4
BRCR is an 8-bit readable/writable register that enables address output on bus lines A
enables or disables release of the bus to an external device.
Bit
Modes
1 and 2
Modes
3 and 4
BRCR is initialized to H'FE in modes 1 and 2, and to H'EE in modes 3 and 4, by a reset and in
hardware standby mode. It is not initialized in software standby mode.
Bit 7—Address 23 Enable (A23E): Enables PA
0 in this bit enables A
and PA
Bit 7
A23E
0
1
Bit 6—Address 22 Enable (A22E): Enables PA
0 in this bit enables A
and PA
Bit 6
A22E
0
1
Rev.4.00 Aug. 20, 2007 Page 110 of 638
REJ09B0395-0400
4
5
has its ordinary port functions.
has its ordinary port functions.
Initial value
Read/Write
Initial value
Read/Write
Bus Release Control Register (BRCR)
Description
PA
PA
Description
PA
PA
A23E
23
22
R/W
Address 23 to 20 enable
These bits enable PA
used for A
4
4
5
5
⎯
7
1
1
output from PA
output from PA
is the A
is an input/output pin
is the A
is an input/output pin
A22E
23
22
R/W
23
⎯
address output pin
address output pin
6
1
1
to A
20
4
5
. In modes other than 3 and 4, this bit cannot be modified
. In modes other than 3 and 4, this bit cannot be modified
address output
A21E
R/W
⎯
5
1
1
7
to PA
4
5
to be used as the A
to be used as the A
4
A20E
to be
⎯
⎯
4
1
0
⎯
⎯
⎯
3
1
1
Reserved bits
Bus release enable
Enables or disables release
of the bus to an external device
23
22
address output pin. Writing
address output pin. Writing
⎯
⎯
⎯
2
1
1
⎯
⎯
⎯
1
1
1
23
(Initial value)
(Initial value)
to A
BRLE
R/W
R/W
20
0
0
0
and