3.5.25. Data Comparator Mask Registers, ETMDCMRn

The ETMDCMR characteristics are:


Holds a 32-bit data mask, used to mask the data value held in the corresponding ETMDCVR.

Usage constraints

Each ETMDCMR is used with the corresponding ETMDCVR. See Data Comparator Mask Registers, ETMDCMRn.

ETMDCRs are always even-numbered registers.


The number of ETMDCMRs is implementation defined, and is specified by ETMCCR bits [12:8]. See Configuration Code Register, ETMCCR. From ETMv3.3 the number of ETMDCMRs can be zero.

Each ETMDCMR has the same bit assignments.

Unimplemented ETMDCMRs are RAZ/WI.


See the register summary in Table 3.3, and Reset behavior.

Figure 3.25 shows the ETMDCMR bit assignments.

Figure 3.25. ETMDCMR bit assignments

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Table 3.35 shows the ETMDCMR bit assignments.

Table 3.35. ETMDCMR bit assignments


Defined in ETM architecture versions



v1.0 and later

Data mask

When a data mask bit is set to 1, the corresponding bit in the ETMDCVR is disregarded in the comparison and must be zero.

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