Break Bus Cycle Register A (Bbra) - Hitachi SH7751 Hardware Manual

Bits 3, 1, and 0—Break Address Mask A2 to A0 (BAMA2–BAMA0): These bits specify which
bits of the channel A break address (BAA31–BAA0) set in BARA are to be masked.
Bit 3: BAMA2 Bit 1: BAMA1
0 0
1
1 0
1
Note: *: Don't care
20.2.5

Break Bus Cycle Register A (BBRA)

Bit: 15
—
Initial value: 0
R/W: R
Bit: 7
—
Initial value: 0
R/W: R
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.
Bit 0: BAMA0
0
1
0
1
0
1
*
14 13
— —
0 0
R R
6 5
SZA2 IDA1
0 0
R/W R/W
Description
All BARA bits are included in break conditions
Lower 10 bits of BARA are masked, and not
included in break conditions
Lower 12 bits of BARA are masked, and not
included in break conditions
All BARA bits are masked, and not included in
break conditions
Lower 16 bits of BARA are masked, and not
included in break conditions
Lower 20 bits of BARA are masked, and not
included in break conditions
Reserved (cannot be set)
12 11
— —
0 0
R R
4 3
IDA0 RWA1 RWA0
0 0
R/W R/W
Rev. 3.0, 04/02, page 757 of 1064
10 9
— —
0 0
R R
2 1
SZA1 SZA0
0 0
R/W R/W R/W
8
—
0
R
0
0