PIC16LF18323-ESLASHP datasheet(54/442 Pages) MICROCHIP

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PIC16(L)F18313/18323

DS40001799A-page 54

Preliminary

 2015 Microchip Technology Inc.

4.3

Code Protection

Code protection allows the device to be protected from

unauthorized access. Program memory protection and

data memory are controlled independently. 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. Self-writing the

program memory is dependent upon the write

protection

setting.

See

Section 4.4

“Write

Protection”

for more information.

4.3.2

DATA MEMORY PROTECTION

The entire data EEPROM is protected from external

reads and writes by the CPD bit in the Configuration

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

EEPROM memory are inhibited and a read will return

all ‘0’s. The CPU can continue to read and write

EEPROM memory, regardless of the protection bit

settings.

4.4

Write Protection

Write protection allows the device to be protected from

unintended self-writes. Applications, such as boot

loader 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 10.4.7, NVMREG EEPROM, User ID, Device

ID and Configuration Word Access for more

information on accessing these memory locations. For

more information on checksum calculation, see the

“PIC16(L)F183XX

Memory

Programming

Specification”

(DS40001738).

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