Renesas SH7709S Manual De Usuario
Rev. 5.00, 09/03, page 239 of 760
Bit 0—Area 6 Bus Type (A6PCM): Designates whether to access physical space area 6 as
PCMCIA space.
PCMCIA space.
Bit 0: A6PCM
Description
0
Physical space area 6 accessed as ordinary memory
(Initial value)
1
Physical space area 6 accessed as PCMCIA space
10.2.2
Bus Control Register 2 (BCR2)
Bus control register 2 (BCR2) is a 16-bit readable/writable register that selects the bus size of each
area and whether an 8-bit port is used or not. It is initialized to H'3FF0 by a power-on reset, but is
not initialized by a manual reset or in standby mode. Do not access external memory outside area
0 until BCR2 register initialization is complete.
area and whether an 8-bit port is used or not. It is initialized to H'3FF0 by a power-on reset, but is
not initialized by a manual reset or in standby mode. Do not access external memory outside area
0 until BCR2 register initialization is complete.
Bit:
15
14
13
12
11
10
9
8
—
—
A6SZ1
A6SZ0
A5SZ1
A5SZ0
A4SZ1
A4SZ0
Initial value:
0
0
1
1
1
1
1
1
R/W:
R
R
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
A3SZ1
A3SZ0
A2SZ1
A2SZ0
—
—
—
—
Initial value:
1
1
1
1
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R
R
R
R
Bits 15, 14, 3, 2, 1, and 0—Reserved: These bits are always read as 0. The write value should
always be 0.
always be 0.
Bits 2n + 1, 2n—Area n (2–6) Bus Size Specification (AnSZ1, AnSZ0): Specify the bus size of
physical space area n (n
physical space area n (n
=
2 to 6).