PIC16LF1827PIC16LF1828 PIC16LF1829 PIC16LF18313 PIC16LF18323 PIC16LF18324 PIC16LF18325 PIC16LF18326 PIC16LF18344 PIC16LF18345 PIC16LF18346 PIC16LF18424 PIC16LF18425 PIC16LF18426 PIC16LF18444 PIC16LF18445 PIC16LF18446 PIC16LF1847 PIC16LF18854 PIC16LF18855 PIC16LF18856 PIC16LF18857 PIC16LF18875 PIC16LF18876 PIC16LF18877 PIC16LF1902 PIC16LF1903 PIC16LF1904 PIC16LF1906 PIC16LF1907 PIC16LF19155 PIC16LF19156 PIC16LF19175 PIC16LF19176 PIC16LF19185 PIC16LF19186 PIC16LF19195 PIC16LF19196 PIC16LF19197 PIC16LF1933 PIC16LF1934 PIC16LF1936 PIC16LF1937 PIC16LF1938 PIC16LF1939 PIC16LF1946 PIC16LF1947 PIC16LF627 PIC16LF627A PIC16LF628 PIC16LF628A PIC16LF648A PIC16LF818 PIC16LF819 PIC16LF87 PIC16LF870 PIC16LF871 PIC16LF872 PIC16LF873 PIC16LF873A PIC16LF874 PIC16LF874A PIC16LF876 PIC16LF876A PIC16LF877 PIC16LF877A PIC16LF88
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.
Target Voltage Below 2.7V
If voltage is less than 2.7V programming is severely limited - it is impossible to bulk erase the device, it is also impossible to erase configuration bits, EEPROM.
NSDSP cannot detect target voltage and it assumes that the voltage is above 2.7V. If the actual target voltage is less, programming will fail. However, if you tell NSDSP that the target voltage is below 2.7V through programming software, NSDSP will use special low-voltage programming mode. In this mode, NSDSP verifies if the desired programming can be performed at voltages below 2.7V, and if it is possible (device is not code protected, configuration bits do not change or only change from 1 to 0, EEPROM is not programmed), it performs the programming. If such programming is impossible, NSDSP software will stop and show an error message.
Programming in low-voltage mode may be considerably slower. In addition, you may need to decrease programming speed to 3MHz or below.
We have measured time necessary to program and verify PIC16LF1827.
|Operation||Time||Programming and Verification||1.5s||Programming only||1.3s||Verification only||0.2s|
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 PIC16LF1827 and may be debugged when debugging software becomes available.
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