MTBDWT_FCT0 field descriptions (continued)Field Description0 No match.1 Match occurred.23–20ReservedThis field is reserved.This read-only field is reserved and always has the value 0.19–16ReservedThis field is reserved.This read-only field is reserved and always has the value 0.15–12DATAVADDR0Data Value Address 0Since 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 linkedaddress comparison.If MTBDWT_COMP0 is used as a data watchpoint and MTBDWT_COMP1 as an address watchpoint,DATAVADDR0 must be set.11–10DATAVSIZEData Value SizeFor 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.9ReservedThis field is reserved.This read-only field is reserved and always has the value 0.8DATAVMATCHData Value MatchThe assertion of this bit enables data value comparison. For this implementation, MTBDWT_COMP0supports address or data value comparisons; MTBDWT_COMP1 only supports address comparisons.0 Perform address comparison.1 Perform data value comparison.7–4ReservedThis field is reserved.This read-only field is reserved and always has the value 0.3–0FUNCTIONFunctionSelects the action taken on a comparator match. If MTBDWT_COMP0 is used for a data value andMTBDWT_COMP1 for an address value, then MTBDWT_FCT1[FUNCTION] must be set to zero. For thisconfiguration, MTBDWT_MASK1 can be set to a non-zero value, so the combined comparators match ona 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.Memory Map and Register DefinitionKL04 Sub-Family Reference Manual, Rev. 3.1, November 2012290 Freescale Semiconductor, Inc.
