PIC18F67K22

Support summary

• Programming - Yes
• Debugging provisions - Yes

ICSP Connection

All VSS and VDD pins must be connected. Even if one of these pins is not connected, programming may fail.

Refer to the datasheet for alternative connections of ENVREG pin.

LVP Limitations

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

These limitations may be avoided with High-Voltage Programming (HVP), however NSDSP requires an external circuit for HVP.

Target Voltage below 2.7V

If voltage is less than 2.7V 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 2.7V. This ensures fast programming at usual voltages. However, if you want to program at voltages below 2.7V, you must specify the actual target voltage through programming software, or the programming will fail. If you specify the voltage below 2.7V 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 2.7V.

When programming at voltages below 2.7V, NSDSP tries to save time, and therefore does not erase data EEPROM unless some part of data EEPROM needs to be programmed. If erasing data EEPROM is necessary, you can erase the device manually before programming.

Programming Benchmarks

We have measured time necessary to program and verify PIC18F67K22.

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

Debugging

NSDSP firmware contains all the necessary provisions for debugging PIC18F67K22 and may be debugged when debugging software becomes available.

Links

Microchip PIC18F67K22 page