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Support summary

  • NSDSP Programming - Yes
  • NSDSP Debugging - No
  • NSDS Compiler - No
ICSP connection


LVP Limitations

Since NSDSP is a Low-Voltage Programmer (LVP), it can only program PIC devices if LVP configuration bit is enabled. Fresh (unprogrammed) devices have LVP bit set and therefore they can be programmed. It is impossible to disable LVP bit during LVP programming, but if the device has been previously programmed with HVP programmer, the LVP bit may have been disabled.

When brown-out is enabled with BOREN configuration bit, LVP is only possible when the VDD voltage is above the brown-out threshold.

NSDSP cannot perform High-Voltage Programming (HVP) with PIC16F627 even if you install HVP circuit.


Target Voltage below 4.5V

If voltage is less than 4.5V it is impossible to bulk erase the device. Unless the PIC device is code protected, NSDSP still can program the device, however, without the bulk erase it takes longer.

NSDSP cannot detect target voltage and it assumes that the voltage is above 4.5V. This ensures fast programming at usual voltages. However, if you want to program at voltages below 4.5V, you must specify the actual target voltage through programming software, or the programming will fail. If you specify the voltage below 4.5V NSDSP will apply special programming algorithm, which does not use bulk erase, but is slower than the regular algorithm.

If you are programming a device which is code protected, NSDSP cannot remove protection if the voltage is below 4.5V.

When programming at voltages below 4.5V, NSDSP tries to save time, and therefore does not erase memory areas which are not being programmed. If such erasing is needed, you can erase the device manually before programming.


Programming Benchmarks

We have measured time necessary to program and verify PIC16F627.

Operation > 4.5V< 4.5V
Programming and Verification 4.8s7.1s
Programming only 4.7s7.0s
Verification only 0.1s0.1s

The measurements reflect the time necessary to program/verify the entire chip, including all user programmable memory areas and very slow data EEPROM.



NSDSP cannot be used to debug PIC16F627.



Microchip PIC16F627 page

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