Target Circuit Design Precautions

The figure below shows the active emulator lines with some example components that will prevent the MPLAB® REAL ICE™ in-circuit emulator system from functioning.

Figure: Improper Circuit Components

TargetPrecautions.jpg
  • Do not use capacitors on MCLR: they will prevent fast transitions of VPP.
  • Do not use pull-ups on PGC/PGD: they will divide the voltage levels since these lines have 4.7 kΩ pull-down resistors in the emulator.
  • Do not use multiplexing on PGC/PGD: they are dedicated for communications to the emulator.
  • Do not use capacitors on PGC/PGD: they will prevent fast transitions on data and clock lines during programming and debug communications.
  • Do not use diodes on PGC/PGD: they will prevent bidirectional communication between the emulator and the target device.
  • Do not exceed recommended cable lengths: For acceptable cable lengths, see Section 11.5.2 “Modular Cable and Connector”.

Additional design information is available in the Development Tools Design Advisory.

For other operational issues, see Loopback Test Board.

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