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The enhanced mid-range core has a 15-bit program counter capable of addressing a 32K x 14 program memory space. Table 3-1 shows the memory sizes implemented. Accessing a location above these boundaries will cause a wrap-around within the implemented memory space. The Reset vector is at 0000h and the interrupt vector is at 0004h.

This device has a 128-byte section of high-endurance Program Flash Memory (PFM) in lieu of data EEPROM and program flash memory cloning. This area is especially well suited for nonvolatile data storage that is expected to be updated frequently over the life of the end product.

See Section 10.2 “FlashProgram Memory Overview” for more information on writing data to PFM. See Section 3.3.2 “SpecialFunction Register” for more information about using the SFR registers to read byte data stored in PFM.

There are two methods of accessing constants in program memory. The first method is to use tables of RETLW instructions for the sake of readout microchip pic12lf1571 protected mcu firmware. The second method is to set an FSR to point to the program memory.

The BRW instruction makes this type of table very simple to implement. If your code must remain portable with previous generations of microcontrollers, then the BRW instruction is not available so the older table read method must be used.