Rev. 5.00, 09/03, page 154 of 760
7.2.3
Break Bus Cycle Register A (BBRA)
Break bus cycle register A (BBRA) is a 16-bit read/write register, which specifies (1) CPU cycle
or DMAC cycle, (2) instruction fetch or data access, (3) read or write, and (4) operand size in the
break conditions of channel A. A power-on reset initializes BBRA to H'0000.
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
CDA1
CDA0
IDA1
IDA0
RWA1
RWA0
SZA1
SZA0
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits 15 to 8—Reserved: These bits are always read as 0. The write value should always be 0.
Bits 7 and 6—CPU Cycle/DMAC Cycle Select A (CDA1, CDA0): Selects the CPU cycle or
DMAC cycle as the bus cycle of the channel A break condition.
Bit 7: CDA1
Bit 6: CDA0
Description
0
0
Condition comparison is not performed
(Initial value)
*
1
The break condition is the CPU cycle
1
0
The break condition is the DMAC cycle
*
: Don’t care
Bits 5 and 4—Instruction Fetch/Data Access Select A (IDA1, IDA0): Selects the instruction
fetch cycle or data access cycle as the bus cycle of the channel A break condition.
Bit 5: IDA1
Bit 4: IDA0
Description
0
0
Condition comparison is not performed
(Initial value)
1
The break condition is the instruction fetch cycle
1
0
The break condition is the data access cycle
1
The break condition is the instruction fetch cycle or data access
cycle
Summary of Contents for SH7709S
Page 2: ......
Page 44: ...Rev 5 00 09 03 page xliv of xliv ...
Page 62: ...Rev 5 00 09 03 page 18 of 760 ...
Page 128: ...Rev 5 00 09 03 page 84 of 760 ...
Page 146: ...Rev 5 00 09 03 page 102 of 760 ...
Page 224: ...Rev 5 00 09 03 page 180 of 760 ...
Page 246: ...Rev 5 00 09 03 page 202 of 760 ...
Page 266: ...Rev 5 00 09 03 page 222 of 760 ...
Page 370: ...Rev 5 00 09 03 page 326 of 760 ...
Page 432: ...Rev 5 00 09 03 page 388 of 760 ...
Page 532: ...Rev 5 00 09 03 page 488 of 760 ...
Page 598: ...Rev 5 00 09 03 page 554 of 760 ...
Page 630: ...Rev 5 00 09 03 page 586 of 760 ...
Page 656: ...Rev 5 00 09 03 page 612 of 760 ...
Page 684: ...Rev 5 00 09 03 page 640 of 760 ...
Page 700: ...Rev 5 00 09 03 page 656 of 760 ...
Page 758: ...Rev 5 00 09 03 page 714 of 760 ...
Page 807: ...SH7709S Group Hardware Manual REJ09B0081 0500O ADE 602 250C ...