NXP Semiconductors MC9S12VRP64, Руководство владельца

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S12S Debug Module (S12DBGV2)
MC9S12VRP Family Reference Manual Rev. 1.3
218 NXP Semiconductors
6.4.2.1.4 Comparator A Data Bus Comparison NDB Dependency
Comparator A features an NDB control bit, which allows data bus comparators to be configured to either
trigger on equivalence or trigger on difference. This allows monitoring of a difference in the contents of
an address location from an expected value.
When matching on an equivalence (NDB=0), each individual data bus bit position can be masked out by
clearing the corresponding mask bit (DBGADHM/DBGADLM) so that it is ignored in the comparison. A
match occurs when all data bus bits with corresponding mask bits set are equivalent. If all mask register
bits are clear, then a match is based on the address bus only, the data bus is ignored.
When matching on a difference, mask bits can be cleared to ignore bit positions. A match occurs when any
data bus bit with corresponding mask bit set is different. Clearing all mask bits, causes all bits to be ignored
and prevents a match because no difference can be detected. In this case address bus equivalence does not
cause a match.
6.4.2.2 Range Comparisons
Using the AB comparator pair for a range comparison, the data bus can also be used for qualification by
using the comparator A data registers. Furthermore the DBGACTL RW and RWE bits can be used to
qualify the range comparison on either a read or a write access. The corresponding DBGBCTL bits are
ignored. The SZE and SZ control bits are ignored in range mode. The comparator A TAG bit is used to tag
range comparisons. The comparator B TAG bit is ignored in range modes. In order for a range comparison
using comparators A and B, both COMPEA and COMPEB must be set; to disable range comparisons both
must be cleared. The comparator A BRK bit is used to for the AB range, the comparator B BRK bit is
ignored in range mode.
When configured for range comparisons and tagging, the ranges are accurate only to word boundaries.
6.4.2.2.1 Inside Range (CompA_Addr

address

CompB_Addr)
In the Inside Range comparator mode, comparator pair A and B can be configured for range comparisons.
This configuration depends upon the control register (DBGC2). The match condition requires that a valid
1 1 $0000 Byte No databus comparison
1 1 $FF00 Byte, data(ADDR[n])=DH Match data at ADDR[n]
Table 6-35. NDB and MASK bit dependency
NDB
DBGADHM[n] /
DBGADLM[n]
Comment
0 0 Do not compare data bus bit.
0 1 Compare data bus bit. Match on equivalence.
1 0 Do not compare data bus bit.
1 1 Compare data bus bit. Match on difference.
SZE SZ
DBGADHM,
DBGADLM
Access
DH=DBGADH, DL=DBGADL
Comment