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13.2
Register Descriptions
13.2.1
Bus Control Register 1 (BCR1)
Bus control register 1 (BCR1) is a 32-bit readable/writable register that specifies the function, bus
cycle status, etc., of each area.
BCR1 is initialized to H'00000000 by a power-on reset, but is not initialized by a manual reset or
in standby mode. External memory space other than area 0 should not be accessed until register
initialization is completed.
Bit:
Bit name:
Initial value:
R/W:
Bit:
Bit name:
Initial value:
R/W:
Bit:
Bit name:
Initial value:
R/W:
Bit:
Bit name:
Initial value:
R/W:
Note: * These bits sample external pin values in a power-on reset.
Rev. 4.0, 04/00, page 272 of 850
31
30
ENDIAN MASTER
0/1*
0/1*
R
R
23
22
—
—
0
0
R
R
15
14
HIZMEM
HIZCNT
0
0
R/W
R/W
7
6
A6BST2
A6BST1
0
0
R/W
R/W
29
28
—
A0MPX
0/1*
0
R
R
21
20
A1MBC A4MBC
BREQEN
0
0
R/W
R/W
13
12
A0BST2
A0BST1
0
0
R/W
R/W
5
4
A6BST0 DRAMTP2 DRAMTP1 DRAMTP0
0
0
R/W
R/W
27
26
—
—
0
0
R
R
19
18
PSHR
MEMMPX
0
0
R/W
R/W
11
10
A0BST0
A5BST2
0
0
R/W
R/W
3
2
0
0
R/W
R/W
25
24
IPUP
OPUP
0
0
R/W
R/W
17
16
—
0
0
R/W
R
9
8
A5BST1
A5BST0
0
0
R/W
R/W
1
0
—
A56PCM
0
0
R
R/W
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