3.5.42. Extended External Input Selection Register, ETMEXTINSELR, ETMv3.1 and later

The ETMEXTINSELR characteristics are:


Selects the extended external inputs. See External inputs for more information.

Usage constraints

There are no usage constraints.


This register is only available in ETMv3.1 or later.

The number of extended external input selectors is implementation defined, is specified by ETMCCER bits [2:0], and can be zero. See Configuration Code Extension Register, ETMCCER, ETMv3.1 and later:

  • if the ETM implements fewer than four extended external input selectors then the unused extended external input selector fields in the ETMEXTINSELR are RAZ/WI

  • if the ETM does not implement any extended external input selectors then the ETMEXTINSELR is RAZ/WI.

The width of the extended external input bus is implementation defined, up to 256 bits. Depending on the width of the bus, high order bits of the Extended external input selector fields might be RAZ/WI.


See the register summary in Table 3.3 and Reset behavior.

Figure 3.39 shows the ETMEXTINSELR bit assignments.

Figure 3.39. ETMEXTINSELR bit assignments

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Table 3.53 shows the ETMEXTINSELR bit assignments.

Table 3.53. ETMEXTINSELR bit assignments

[31:24]v3.1Extended external input selector 4
[23:16]v3.1Extended external input selector 3
[15:8]v3.1Extended external input selector 2
[7:0]v3.1Extended external input selector 1

[a] The first ETM architecture version that defines the field.

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