HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 155

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

Bit 5—Address 21 Enable (A21E): Enables PA
0 in this bit enables A
and PA
Bit 5
A21E
0
1
Bit 4—Address 20 Enable (A20E): Enables PA
written to this bit, PA
address output pin, and in modes 1 and 2, as a normal port pin.
Bit 4
A20E
0
1
Bits 3 to 1—Reserved: These bits cannot be modified and are always read as 1.
Bit 0—Bus Release Enable (BRLE): Enables or disables release of the bus to an external device.
Bit 0
BRLE
0
1
6.2.5
Notes: 1. 1 must not be written in bits 5 to 3.
Bit
Initial value
Read/Write
6
2. 0 must not be written in bit 2.
has its ordinary port functions.
Bus Control Register (BCR)
ICIS1
R/W
7
1
Description
PA
PA
Description
PA
PA
Description
The bus cannot be released to an external device
BREQ and BACK can be used as input/output pins
The bus can be released to an external device
7
21
6
6
functions as address output A
7
7
output from PA
is the A
is an input/output pin
is the A
is an input/output pin (In mode 1 or 2)
ICIS0
R/W
6
1
21
20
address output pin
address output pin (In mode 3 or 4)
0*
⎯
⎯
5
1
6
. In modes other than 3 and 4, this bit cannot be modified
0*
⎯
⎯
6
7
4
1
to be used as the A
to be used as an address output pin. When 0 is
20
. In modes 3 and 4, PA
Rev.4.00 Aug. 20, 2007 Page 111 of 638
0*
—
⎯
3
1
21
1*
⎯
⎯
2
address output pin. Writing
2
7
functions as an
RDEA
REJ09B0395-0400
R/W
6. Bus Controller
1
1
(Initial value)
(Initial value)
WAITE
R/W
0
0