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1.1.1. Operating Conditions
1.1.2. User Flash Memory Operations During In-System Programming
1.1.3. Interrupting In-System Programming
1.1.4. MultiVolt Devices and Power-Up Sequences
1.1.5. I/O Pins Tri-Stated During In-System Programming
1.1.6. Pull-Up and Pull-Down of JTAG Pins During In-System Programming
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1.4.4. Random Signals on JTAG Pins
During normal operation, TAP controller of each device must be in the test-logic-reset state.
To force the device back into this state, try pulling the TMS signal high and pulsing the TCK signal six times. If the device successfully powers up, you must add a higher pull-down resistor on the TCK signal.