PIC16LF628APIC16LF648A PIC16LF720 PIC16LF721 PIC16LF722 PIC16LF722A PIC16LF723 PIC16LF723A PIC16LF724 PIC16LF726 PIC16LF727 PIC16LF818 PIC16LF819 PIC16LF87 PIC16LF870 PIC16LF871 PIC16LF872 PIC16LF873 PIC16LF873A PIC16LF874 PIC16LF874A PIC16LF876 PIC16LF876A PIC16LF877 PIC16LF877A PIC16LF88
Programming is impossible at voltages below 4.5V.
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.
These limitations may be avoided with High-Voltage Programming (HVP), however NSDSP requires an external circuit for HVP. Microchip programming specificatons for PIC16LF628A require that VPP is applied to MCLR before VDD. Since NSDSP does not have any control of VDD, this requirement cannot be satisfied, however, in our tests the HVP programming has succeeded even without VDD manipulation. Therefore, NSDSP software, starting release 126, supports HVP programming for PIC16LF628A.
Be careful. It is possible to brick PIC16LF628A with HVP programming if each of these three conditions is met:
NSDSP cannot be used to debug PIC16LF628A.
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