PIC16 datasheet(45/418 Pages) MICROCHIP

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DS40001609C-page 45

PIC16(L)F1508/9

4.3

Code Protection

Code protection allows the device to be protected from

unauthorized access. Internal access to the program

memory is unaffected by any code protection setting.

4.3.1

PROGRAM MEMORY PROTECTION

The entire program memory space is protected from

external reads and writes by the CP bit in Configuration

Words. When CP = 0, external reads and writes of

program memory are inhibited and a read will return all

‘0’s. The CPU can continue to read program memory,

regardless of the protection bit settings. Writing the

program memory is dependent upon the write

protection

setting.

See

Section 4.4

“Write

Protection” for more information.

4.4

Write Protection

Write protection allows the device to be protected from

unintended

self-writes.

Applications,

such

bootloader software, can be protected while allowing

other regions of the program memory to be modified.

The WRT<1:0> bits in Configuration Words define the

size of the program memory block that is protected.

4.5

User ID

Four memory locations (8000h-8003h) are designated as

ID locations where the user can store checksum or other

code identification numbers. These locations are

readable and writable during normal execution. See

Section 10.4 “User ID, Device ID and Configuration

Word Access” for more information on accessing these

memory locations. For more information on checksum

calculation, see the “PIC12(L)F1501/PIC16(L)F150X

Memory Programming Specification” (DS41573).

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