Oscillator not working. Check your
Configuration bits setting for the oscillator. If you are using an
external oscillator, try using an internal oscillator. If you are
using an internal PLL, make sure your PLL settings are correct.
No power to the target board. Check the
power cable connection.
Incorrect VDD voltage. The
VDD voltage is outside the specifications for this
device. See the device programming specification for details.
Physical disconnect. The debugger has
become physically disconnected from the computer and/or the target
board. Check the communications cables’ connections.
Communications lost. Debugger to PC communication has somehow
been interrupted. Reconnect to the debugger in MPLAB X
IDE
or MPLAB IPE.
Device not seated. The device is not properly seated on the
target board. If the debugger is properly connected and the target board is powered, but
the device is absent or not plugged in completely, you may receive the message:
Target Device ID (0x0) does not match expected Device ID (0x%x) ,
where %x is the expected device ID.
Device is code-protected. Check your
Configuration bits settings for code protection.
Application code corrupted. The target application has become
corrupted or contains errors. Try rebuilding and reprogramming the target application.
Then initiate a Power-On-Reset of the target.
Incorrect programming pins. The PGC/PGD pin pairs are not
correctly programmed in your Configuration bits (for devices with multiple PGC/PGD pin
pairs).
Additional setup required. Other configuration settings are
interfering with debugging. Any configuration setting that would prevent the target from
executing code will also prevent the debugger from putting the code into Debug
mode.
Incorrect brown-out voltage. Brown-out
Detect voltage is greater than the operating voltage VDD.
This means the device is in Reset and cannot be debugged.
Incorrect connections. Review the guidelines in Operation for the correct
communication connections.
Invalid request. The debugger cannot always perform the action requested. For
example, the debugger cannot set a breakpoint if the target application is currently
running.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.