PIC10LF322T-EMCSQTP datasheet(24/210 Pages) MICROCHIP

24 / 210 page

PIC10(L)F320/322

DS41585A-page 24

Preliminary

 2011 Microchip Technology Inc.

3.2

Code Protection

Code protection allows the device to be protected from

unauthorized access. Program memory protection and

data memory protection are controlled independently.

Internal access to the program memory and data

memory are unaffected by any code protection setting.

3.2.1

PROGRAM MEMORY PROTECTION

The entire program memory space is protected from

external reads and writes by the CP bit in Configuration

Word. 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 3.3

“Write

Protection”

for more information.

3.3

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 Word define the

size of the program memory block that is protected.

3.4

User ID

Four memory locations (2000h-2003h) 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 3.5 “Device ID and Revision ID”

for more

information on accessing these memory locations. For

more information on checksum calculation, see the

“PIC10(L)F320/322

Flash

Memory

Programming

Specification” (DS41572).

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