SH7709S Datasheet, PDF (283/807 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

Bit 0—Area 6 Bus Type (A6PCM): Designates whether to access physical space area 6 as
PCMCIA space.
Bit 0: A6PCM
0
1
Description
Physical space area 6 accessed as ordinary memory
Physical space area 6 accessed as PCMCIA space
(Initial value)
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.
Bit: 15
—
Initial value: 0
R/W: R
14
13
12
11
10
9
8
— A6SZ1 A6SZ0 A5SZ1 A5SZ0 A4SZ1 A4SZ0
0
1
1
1
1
1
1
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.
Bits 2n + 1, 2n—Area n (2–6) Bus Size Specification (AnSZ1, AnSZ0): Specify the bus size of
physical space area n (n = 2 to 6).
Rev. 5.00, 09/03, page 239 of 760