8-bit MCU has invalid calibration data (0) when connecting to a PICkit™ 3

"Target Detected. The target has invalid calibration data (0)."

The device you are testing has the MOLVW instruction erased.

The last memory location expected in MPLAB® X IDE is a MOVLW instruction. At reset, earlier 8-bit PIC®s start executing at address (-1). A MOVLW instruction is inserted at this address to the factory measured oscillator calibration value into W-reg to begin recording the calibration data.

Try reading the device before programming. Take note of the instruction in the last memory location of the device and then program the part with your code, ensuring that last memory location stays as a MOVLW instruction. The PICkit™ 3 standalone GUI allows you to manually set the OSCAL (MOVLW).

  Return to Top

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.