PIC18F67K22PIC18F67K40 PIC18F67K90 PIC18F83J11 PIC18F83J90 PIC18F84J11 PIC18F84J90 PIC18F8520 PIC18F8525 PIC18F8527 PIC18F8585 PIC18F85J10 PIC18F85J11 PIC18F85J15 PIC18F85J50 PIC18F85J90 PIC18F85J94 PIC18F85K22 PIC18F85K90 PIC18F8620 PIC18F8621 PIC18F8622 PIC18F8627 PIC18F8628 PIC18F8680 PIC18F86J10 PIC18F86J11 PIC18F86J15 PIC18F86J16 PIC18F86J50 PIC18F86J55 PIC18F86J60 PIC18F86J65 PIC18F86J72 PIC18F86J90 PIC18F86J93 PIC18F86J94 PIC18F86J99 PIC18F86K22 PIC18F86K90 PIC18F8720 PIC18F8722 PIC18F8723 PIC18F87J10 PIC18F87J11 PIC18F87J50 PIC18F87J60 PIC18F87J72 PIC18F87J90 PIC18F87J93 PIC18F87J94 PIC18F87K22 PIC18F87K90 PIC18F95J94 PIC18F96J60 PIC18F96J65 PIC18F96J94 PIC18F96J99 PIC18F97J60 PIC18F97J94
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.
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.
We have measured time necessary to program and verify PIC18F67K22.
|Operation||> 2.7V||< 2.7V||Programming and Verification||6.5s||7.9s||Programming only||5.7s||7.1s||Verification only||2.5s||2.5s|
The measurements reflect the time necessary to program/verify the entire chip, including all user programmable memory areas and very slow data EEPROM.
NSDSP firmware contains all the necessary provisions for debugging PIC18F67K22 and may be debugged when debugging software becomes available.
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