PIC18F25K40

PIC18(L)F2X/4XK40 PIC18(L)F2X/4XK40 Memory Programming Specification 1.0 OVERVIEW This programming specification describes an SPI-based programming method for the PIC18(L)F2X/4XK40 family of microcontrollers. Section 3.0 “Programming Algorithms” describes the programming commands, programming algorithms and electrical specifications which are used in that particular programming method. Appendix B contains individual part numbers, device identification and checksum values, pinout and packaging information and Configuration Words. Note 1: This is a SPI-compatible programming method with 8-bit commands. 2: The low-voltage entry code is now 32 clocks and MSb first, unlike previous PIC18 devices which had 33 clocks and LSb first. 1.1 Programming Data Flow Nonvolatile Memory (NVM) programming data can be supplied by either the high-voltage In-Circuit Serial Programming™ (ICSP™) interface or the low-voltage In-Circuit Serial Programming (ICSP) interface. Data can be programmed into the Program Flash Memory (PFM), Data Flash Memory (EEPROM), dedicated “user ID” locations and the Configuration Words. 1.2 Write and/or Erase Selection Erasing or writing is selected according to the command used to begin operation (see Table 3-1). The terminologies used in this document related to erasing/writing to the program memory are defined in Table 1-1 and are detailed below. TABLE 1-1: PROGRAMMING TERMS Term Definition Programmed Cell Erased Cell Erase Write Program A memory cell at logic ‘...