PIC18F45K40

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.

LVP Programming

Low-Voltage Programming (LVP) can only be used for these PIC devices if the 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.

These limitations may be avoided with High-Voltage Programming (HVP). NSDSP-2 can generate high voltage for HVP internally. NSDSP-1 cannot, therefore NSDSP-1 requires NSHVX or an external circuit for HVP.

HVP Programming

NSDSP-2 can program PIC18F45K40 with HVP.

With NSDSP-1, HVP programming is possible, but only with NSHVX High Voltage Extension or an external HVP circuit.

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-2 can detect target voltage, but NSDSP-1 cannot and 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 with NSDSP-1, 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 PIC18F45K40.

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 PIC18F45K40 and may be debugged when debugging software becomes available.

PIC18F45K40 uses ordered halting, has 3 hardware breakpoints.

Debugging does not consume resources in the user space.

Links

Microchip PIC18F45K40 page