PC912XDP512F0MPVR datasheet(715/1348 Pages) FREESCALE

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Chapter 19 S12X Debug (S12XDBGV2) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

717

19.4.2.2

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

speciﬁed type of access causes a match. Thus, if conﬁgured for a byte access of a particular address, a word

access covering the same address does not lead to match.

19.4.2.3

Range Comparisons

When using the AB comparator pair for a range comparison, the data bus can also be used for qualiﬁcation

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

must be set; to disable range comparisons both must be cleared. Similarly for a range CD comparison, 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.

19.4.2.3.1

Inside Range (CompAC_Addr

≤ Address ≤ 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

condition on only one comparator is not valid. An aligned word access which straddles the range boundary

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

Table 19-37. Comparator Access Size Considerations

Comparator

Address

SZE

SZ8

Condition For Valid Match

Comparators

A and C

ADDR[n]

Word and byte accesses of ADDR[n]1

MOVB #$BYTE ADDR[n]

MOVW #$WORD ADDR[n]

1 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.

Comparators

B and D

ADDR[n]

Word and byte accesses of ADDR[n]1

MOVB #$BYTE ADDR[n]

MOVW #$WORD ADDR[n]

Comparators

B and D

ADDR[n]

Word accesses of ADDR[n]1

MOVW #$WORD ADDR[n]

Comparators

B and D

ADDR[n]

Byte accesses of ADDR[n]

MOVB #$BYTE ADDR[n]

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