MCP19110T-ESLASHMJ datasheet(82/226 Pages) MICROCHIP

82 / 226 page

MCP19110/11

DS20002331D-page 82

 2013-2016 Microchip Technology Inc.

12.2

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.

12.2.1

PROGRAM MEMORY PROTECTION

The entire program memory space is protected from

external reads and writes by the CP bit in the

Configuration Word. When CP = 0, external reads and

writes of the 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 12.3

“Write Protection” for more information.

12.3

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 the Configuration Word define

the size of the program memory block that is protected.

12.4

ID Locations

Four

memory

locations

(2000h – 2003h)

are

designated as ID locations where the user can store

checksum or other code identification numbers. These

locations are not accessible during normal execution

but are readable and writable during Program/Verify

mode. Only the Least Significant seven bits of the ID

locations are reported when using MPLAB Integrated

Development Environment (IDE).

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