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2-Wire JTAG Connections

  • J1 vs. J2: JTAG matches or supplies target VCC

  • R2 only needed in case of fuse blow

  • See UG for recommended reset R/C

2-Wire JTAG Details

  • Same JTAG core logic, but optimized interface

  • Only two signals: Test Clock, Test Data In/Out

  • Use of time-division multiplexing

  • No multiplexed GPIO pins are needed for JTAG

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