B.4.1. EXTEST (b0000)

The EXTEST instruction enables a boundary scan chain to be connected between the DBGSDIN and DBGSDOUT pins. External logic, based on the DBGTAPSM, DBGSCREG, and DBGIR signals is required to use the EXTEST function for such a boundary scan chain. Using EXTEST with scan chain 1 or scan chain 2 selected is UNPREDICTABLE.

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