3.12.2. Extended external inputs

The number of extended external inputs implemented by a PTM is implementation defined, and can be zero. If a PTM implements extended external inputs, it must implement:

If you read the Configuration Code Extension Register:

Both of these fields read-as-zero if the PTM does not implement any extended external inputs.

Figure 3.9 shows an implementation with an 8-bit wide extended external input bus and two extended external input selectors.

Figure 3.9. Extended external inputs implementation example

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