MTBDWT_FCT0 field descriptions (continued)
Field Description
0 No match.
1 Match occurred.
23–20
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
19–16
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
15–12
DATAVADDR0
Data Value Address 0
Since the MTB_DWT implements two comparators, the DATAVADDR0 field is restricted to values {0,1}.
When the DATAVMATCH bit is asserted, this field defines the comparator number to use for linked
address comparison.
If MTBDWT_COMP0 is used as a data watchpoint and MTBDWT_COMP1 as an address watchpoint,
DATAVADDR0 must be set.
11–10
DATAVSIZE
Data Value Size
For data value matching, this field defines the size of the required data comparison.
00 Byte.
01 Halfword.
10 Word.
11 Reserved. Any attempts to use this value results in UNPREDICTABLE behavior.
9
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
8
DATAVMATCH
Data Value Match
The assertion of this bit enables data value comparison. For this implementation, MTBDWT_COMP0
supports address or data value comparisons; MTBDWT_COMP1 only supports address comparisons.
0 Perform address comparison.
1 Perform data value comparison.
7–4
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
3–0
FUNCTION
Function
Selects the action taken on a comparator match. If MTBDWT_COMP0 is used for a data value and
MTBDWT_COMP1 for an address value, then MTBDWT_FCT1[FUNCTION] must be set to zero. For this
configuration, MTBDWT_MASK1 can be set to a non-zero value, so the combined comparators match on
a range of addresses.
0000 Disabled.
0100 Instruction fetch.
0101 Data operand read.
0110 Data operand write.
0111 Data operand (read + write).
others Reserved. Any attempts to use this value results in UNPREDICTABLE behavior.
Chapter 19 Micro Trace Buffer (MTB)
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 321
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