We can Duplicate Microchip Controller PIC18F4580 Flash Memory, please view the Controller PIC18F4580 features for your reference:

Enabling the extended instruction set adds eight additional commands to the existing PIC18 instruction set. These instructions are executed as described in Section 21.2 “Extended Instruction Set”. The Flash program memory is readable, writable and erasable during normal operation over the entire VDD range.

A read from program memory is executed on one byte at a time. A write to program memory is executed on blocks of 8 bytes at a time. Program memory is erased in blocks of 64 bytes at a time. A bulk erase operation may not be issued from user code. Writing or erasing program memory will cease instruction fetches until the operation is complete when Duplicate Microchip Controller PIC18F4580 Flash Memory.

The program memory cannot be accessed during the write or erase, therefore, code cannot execute. An internal programming timer terminates program memory writes and erases. A value written to program memory does not need to be a valid instruction. Executing a program memory location that forms an invalid instruction results in a NOP.

In order to read and write program memory, there are two operations that allow the processor to move bytes between the program memory space and the data RAM:

• Table Read (TBLRD)
• Table Write (TBLWT)

The program memory space is 16 bits wide, while the data RAM space is 8 bits wide. Table reads and table writes move data between these two memory spaces through an 8-bit register (TABLAT). Table read operations retrieve data from program memory and place it into the data RAM space. Figure 6-1 shows the operation of a table read with program memory and data RAM after Duplicate Microchip Controller PIC18F4580 Flash Memory.