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Debugging 8-7
8.5.2 Debug Status Register (DBSR)
The DBSR contains status on debug events and the most recent reset; the status is obtained by
reading the DBSR. The status bits are normally set by debug events or by any of the three reset
types.
Clearing DBSR fields is performed by writing a word to the DBSR, using the mtdbsr extended
mnemonic, having a 1 in all bit positions to be cleared and a 0 in the all other bit positions. The data
written to the DBSR is not direct data, but a mask. A 1 clears the bit and a 0 has no effect.
Application code should not use the DBSR.
12:13 DV1M Data Value Compare 1 Mode
00 Undefined
01 AND
10 OR
11 AND-OR
Type of data comparison used:
All bytes selected by DBCR1[DV1BE] must
compare to the appropriate bytes of DVC1.
One of the bytes selected by
DBCR1[DV1BE] must compare to the
appropriate bytes of DVC1.
The upper halfword or lower halfword must
compare to the appropriate halfword in
DVC1. When performing halfword
compares set DBCR1[DV1BE] = 0011,
1100, or 1111.
14:15 DV2M Data Value Compare 2 Mode
00 Undefined
01 AND
10 OR
11 AND-OR
Type of data comparison used
All bytes selected by DBCR1[DV2BE] must
compare to the appropriate bytes of DVC2.
One of the bytes selected by
DBCR1[DV2BE] must compare to the
appropriate bytes of DVC2.
The upper halfword or lower halfword must
compare to the appropriate halfword in
DVC2. When performing halfword
compares set DBCR1[DV2BE] = 0011,
1100, or 1111.
16:19 DV1BE Data Value Compare 1 Byte
0 Disabled
1 Enabled
Selects which data bytes to use in data
value comparison
20:23 DV2BE Data Value Compare 2 Byte
0 Disabled
1 Enabled
Selects which data bytes to use in data
value comparison
24:31
Reserved