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6.2.2
Break Address Register B (BARB)
BARB is the channel B break address register. The bit configuration is the same as for BARA.
6.2.3
Break Control Register A (BCRA)
7
Bit
:
CMFA
Initial value :
0
R/W
:
R/(W)*
Note: * Only 0 can be written, for flag clearing.
BCRA is an 8-bit readable/writable register that controls channel A PC breaks. BCRA (1) selects
the break condition bus master, (2) specifies bits subject to address comparison masking, and (3)
specifies whether the break condition is applied to an instruction fetch or a data access. It also
contains a condition match flag.
BCRA is initialized to H'00 by a power-on reset and in hardware standby mode.
Bit 7—Condition Match Flag A (CMFA): Set to 1 when a break condition set for channel A is
satisfied. This flag is not cleared to 0.
Bit 7
CMFA
Description
0
[Clearing condition]
When 0 is written to CMFA after reading CMFA = 1
1
[Setting condition]
When a condition set for channel A is satisfied
Bit 6—CPU Cycle/DTC Cycle Select A (CDA): Selects the channel A break condition bus
master.
Bit 6
CDA
Description
0
PC break is performed when CPU is bus master
1
PC break is performed when CPU or DTC is bus master
122
6
5
CDA
BAMRA2
BAMRA1
0
0
R/W
R/W
R/W
4
3
2
BAMRA0
CSELA1
0
0
R/W
R/W
1
0
CSELA0
BIEA
0
0
0
R/W
R/W
(Initial value)
(Initial value)
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