Concept of microcontroller bit number: The number of bits of a microcontroller depends on the number of bits of the data bus. For example, the commonly used 8 bits takes the data width as 8 bits, and one byte is transmitted each time.
As for the Harvard bus structure of PIC, the program memory uses an independent instruction bus and is therefore not restricted by the data bus.
PIC microcontroller system configuration word: used to set the microcontroller's program protection, online debugging, low-voltage programming, power-down latch reset enable bit, power-on timing, watchdog, oscillator mode and other basic working environments. It can only be set by software when burning the program and cannot be accessed by the user in the program.
Configuration method: Use the options on the software to select, or use the "__CONFIG" preprocessor directive in the program to define the configuration bits of the fixed chip;
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