OPTION_REG datasheet(80/222 Pages) MICROCHIP

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MCP19111

DS22331A-page 80

 2013 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 7 bits of the ID

locations are reported when using MPLAB Integrated

Development Environment (IDE).

12.5

Device ID and Revision ID

The memory location 2006h is where the Device ID and

Revision ID are stored. The upper nine bits hold the

Device ID. The lower five bits hold the Revision ID.

Development tools, such as device programmers and

debuggers, may be used to read the Device ID and

Revision ID.

DEVICEID: DEVICE ID REGISTER(1)

DEV<8:3>

bit 13

bit 8

DEV<2:0>

REV<4:0>

bit 7

bit 0

Legend:

R = Readable bit

P = Programmable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 13-5

DEV<8:0>: Device ID bits

bit 4-0

REV<4:0>: Revision ID bits

These bits are used to identify the revision.

Note 1:

This location cannot be written.

Device

DEVICEID<13:0> Values

DEV<8:0>

REV<4:0>

MCP19111

10 1111 100

x xxxx

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