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Bits 3, 1, and 0—Break Address Mask A2 to A0 (BAMA2–BAMA0): These bits specify which
bits of the channel A break address 31 to 0 (BAA31–BAA0) set in BARA are to be masked.
Bit 3: BAMA2
Bit 1: BAMA1
Bit 0: BAMA0
Description
0
0
0
All BARA bits are included in break conditions
1
Lower 10 bits of BARA are masked, and not
included in break conditions
1
0
Lower 12 bits of BARA are masked, and not
included in break conditions
1
All BARA bits are masked, and not included in
break conditions
1
0
0
Lower 16 bits of BARA are masked, and not
included in break conditions
1
Lower 20 bits of BARA are masked, and not
included in break conditions
1
*
Reserved (cannot be set)
Note:
*
: Don’t care
20.2.5
Break Bus Cycle Register A (BBRA)
Bit:
15
14
13
12
11
10
9
8
—
—
—
—
—
—
—
—
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R
R
R
R
R
R
R
Bit:
7
6
5
4
3
2
1
0
—
SZA2
IDA1
IDA0
RWA1
RWA0
SZA1
SZA0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Break bus cycle register A (BBRA) is a 16-bit readable/writable register that sets three
conditions—(1) instruction access/operand access, (2) read/write, and (3) operand size—from
among the channel A break conditions.
BBRA is initialized to H'0000 by a power-on reset. It retains its value in standby mode.
Bits 15 to 7—Reserved: These bits are always read as 0, and should only be written with 0.
Содержание SH7750 series
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