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We can Extract Microchip MCU PIC18F6525 Archive, please view the MCU PIC18F6525 features for your reference:

Data EEPROM memory has its own code-protect bits in Configuration Words. External read and write operations are disabled if either of these mechanisms are enabled. The microcontroller itself can both read and write to the internal data EEPROM, regardless of the state of the code-protect Configuration bit. Refer to Section 19.0 “Special Features of the CPU” for additional information.

The data EEPROM is a high-endurance, byte addressable array that has been optimized for the storage of frequently changing information (e.g., program variables or other data that are updated often). Frequently changing values will typically be updated more often than specification D124 or D124A when Extract Microchip MCU PIC18F6525 Archive.

If this is not the case, an array refresh must be performed. For this reason, variables that change infrequently (such as constants, IDs, calibration, etc.) should be stored in Flash program memory. A simple data EEPROM refresh routine is shown in Example 7-3.

If data EEPROM is only used to store constants and/or data that changes rarely, an array refresh is likely not required. See specification D124 or D124A. All PIC18 devices include an 8 x 8 hardware multiplier as part of the ALU. The multiplier performs an unsigned operation and yields a 16-bit result that is stored in the Product register pair, PRODH:PRODL if Extract Microchip MCU PIC18F6525 Archive.

The multiplier’s  operation does not affect any flags in the STATUS register. Making multiplication a hardware operation allows it to be completed in a single instruction cycle. This has the advantages of higher computational throughput and reduced code size for multiplication algorithms and allows the PIC18 devices to be used in many applications previously reserved for digital signal processors.

A comparison of various hardware and software multiply operations, along with the savings in memory and execution time, is shown in Table 8-1. Example 8-1 shows the instruction sequence for an 8 x 8 unsigned multiplication. Only one instruction is required when one of the arguments is already loaded in the WREG register before Extract Microchip MCU PIC18F6525 Archive.

Example 8-2 shows the sequence to do an 8 x 8 signed multiplication. To account for the sign bits of the arguments, each argument’s Most Significant bit (MSb) is tested and the appropriate subtractions are done after EXTRACT IC.