HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 277

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

7.2.2
Initialize BCR2 after a power-on reset and do not write to it thereafter. When writing to it, write
the same values as those the bits are initialized to. Do not access any space other than CS0 until
the register initialization ends.
Bits 15 to 10—Reserved: These bits are always read as 0. The write value should always be 0.
Bits 9 and 8—Bus Size Specification for Area 4 (CS4) (A4SZ1, A4SZ0)
Bit 9: A4SZ1
0
1
Bits 7 and 6—Bus Size Specification for Area 3 (CS3) (A3SZ1, A3SZ0). Effective only when
ordinary space is set.
Bit 7: A3SZ1
0
1
260
Initial value:
Initial value:
Bus Control Register 2 (BCR2)
R/W:
R/W:
Bit:
Bit:
Bit 8: A4SZ0
0
1
0
1
Bit 6: A3SZ0
0
1
0
1
A3SZ1
R/W
15
—
0
R
7
1
A3SZ0
R/W
14
—
0
R
6
1
Description
Longword (32-bit) size
Byte (8-bit) size
Word (16-bit) size
Longword (32-bit) size
Description
Reserved (do not set)
Byte (8-bit) size
Word (16-bit) size
Longword (32-bit) size
A2SZ1
R/W
13
—
0
R
5
1
A2SZ0
R/W
12
—
0
R
4
1
A1SZ1
R/W
11
—
0
R
3
1
A1SZ0
R/W
10
—
0
R
2
1
A4SZ1
R/W
—
9
0
1
0
R
(Initial value)
(Initial value)
A4SZ0
R/W
—
8
0
0
0
R