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型號(hào)：	P312XDP512F0CFUR
廠商：	飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述：	Covers, S12XD, S12XB & S12XA Families
中文描述：	封面，S12XD，S12XB
文件頁(yè)數(shù)：	717/1350頁(yè)
文件大?。?/td>	3951K
代理商：	P312XDP512F0CFUR

Chapter 19 Debug (S12XDBGV2)

MC9S12XDP512 Data Sheet, Rev. 2.17

Freescale Semiconductor

Exact Address Comparator Match (Comparators B and D)

Comparators B and D feature SZ and SZE control bits. If SZE is clear, then the comparator address match

qualification functions the same as for comparators A and C.

If the SZE bit is set the access size (word or byte) is compared with the SZ bit value such that only the

specifiedtypeofaccesscausesamatch.Thus,ifconfiguredforabyteaccessofaparticularaddress,aword

access covering the same address does not lead to match.

Range Comparisons

WhenusingtheABcomparatorpairforarangecomparison,thedatabuscanalsobeusedforqualification

by using the comparator A data and data mask 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. Similarly when using the CD comparator pair for a range comparison, the

data bus can also be used for qualification by using the comparator C data and data mask registers.

Furthermore the DBGCCTL RW and RWE bits can be used to qualify the range comparison on either a

read or a write access if tagging is not selected. The corresponding DBGDCTL bits are ignored. The SZE

and SZ control bits are ignored in range mode. The comparator A and C TAG bits are used to tag range

comparisons for the AB and CD ranges respectively. The comparator B and D TAG bits are ignored in

range modes. In order for a range comparison using comparators A and B, both COMPEA and COMPEB

mustbeset;todisablerangecomparisonsbothmustbecleared.SimilarlyforarangeCDcomparison,both

COMPEC and COMPED must be set. If a range mode is selected SRCA and SRCB must select the same

source (S12X or XGATE). Similarly SRCC and SRCD must select the same source. When configured for

range comparisons and tagging, the ranges are accurate only to word boundaries.

Inside Range (CompAC_Addr

CompBD_Addr)

In the inside range comparator mode, either comparator pair A and B or comparator pair C and D can be

configured for range comparisons. This configuration depends upon the control register (DBGC2). The

match condition requires that a valid match for both comparators happens on the same bus cycle. A match

conditionononlyonecomparatorisnotvalid.Analignedwordaccesswhichstraddlestherangeboundary

will cause a trigger only if the aligned address is inside the range.

Table 19-37. Comparator Access Size Considerations

Condition For Valid Match

Word and byte accesses of ADDR[n]

MOVB #$BYTE ADDR[n]

MOVW #$WORD ADDR[n]

Word and byte accesses of ADDR[n]

MOVB #$BYTE ADDR[n]

MOVW #$WORD ADDR[n]

Word accesses of ADDR[n]

MOVW #$WORD ADDR[n]

Byte accesses of ADDR[n]

MOVB #$BYTE ADDR[n]

A word access of ADDR[n-1] also accesses ADDR[n] but does not generate a match.

The comparator address register must contain the exact address used in the code.

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