PIC16LF1902-ESS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF1902-ESS

28-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

Microchip Technology 

PIC16LF1902/3

4.2 Code Protection

Code protection allows the device to be protected from

unauthorized access. Program memory protection is

controlled independently. Internal access to the

program memory is unaffected by any code protection

setting.

4.2.1 PROGRAM MEMORY PROTECTION

The entire program memory space is protected from

external reads and writes by the CP bit in Configuration

Word 1. 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 4.3 “Write

Protection” for more information.

4.3 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 2 define the

size of the program memory block that is protected.

4.4 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

“PIC16F193X/LF193X/PIC16F194X/LF194X/PIC16LF

190X Memory

(DS41397).

Programming

Specification”

DS41455A-page 40

Preliminary

 2011 Microchip Technology Inc.

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