PIC18LF2431-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF2431-I/ML

28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D

Microchip Technology 

PIC18F2331/2431/4331/4431

23.5 Program Verification and

Code Protection

The overall structure of the code protection on the

PIC18 Flash devices differs significantly from other

PIC® devices.

The user program memory is divided into five blocks.

One of these is a Boot Block of 512 bytes. The

remainder of the memory is divided into four blocks on

binary boundaries.

Each of the five blocks has three code protection bits

associated with them. They are:

• Code-Protect bit (CPn)

• Write-Protect bit (WRTn)

• External Block Table Read bit (EBTRn)

Figure 23-5 shows the program memory organization

for 8 and 16-Kbyte devices, and the specific code

protection bit associated with each block. The actual

locations of the bits are summarized in Table 23-3.

FIGURE 23-5:

CODE-PROTECTED PROGRAM MEMORY FOR PIC18F2331/2431/4331/4431

MEMORY SIZE/DEVICE

Block Code Protection

Controlled By:

8 Kbytes

(PIC18F2331/4331)

Boot Block

Block 0

Block 1

Address

Range

0000h

0FFFh

0200h

0FFFh

1000h

1FFFh

Unimplemented

Read ‘0’s

3FFFh

16 Kbytes

(PIC18F2431/4431)

Boot Block

Block 0

Block 1

Block 2

Block 3

Address

Range

0000h

01FFh

0200h

0FFFh

1000h

1FFFh

2000h

2FFFh

3000h

3FFFh

CPB, WRTB, EBTRB

CP0, WRT0, EBTR0

CP1, WRT1, EBTR1

CP2, WRT2, EBTR2

CP3, WRT3, EBTR3

TABLE 23-3: SUMMARY OF CODE PROTECTION REGISTERS

File Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

300008h CONFIG5L

—

—

—

—

CP3(1) CP2(1)

300009h CONFIG5H CPD

CPB

—

—

—

—

30000Ah CONFIG6L

—

—

—

—

WRT3(1) WRT2(1)

30000Bh CONFIG6H WRTD WRTB WRTC

—

—

—

30000Ch CONFIG7L

—

—

—

—

EBTR3(1) EBTR2(1)

30000Dh CONFIG7H —

EBTRB

—

—

—

—

Legend: Shaded cells are unimplemented.

Note 1: Unimplemented in PIC18F2331/4331 devices; maintain this bit set.

Bit 1

CP1

—

WRT1

—

EBTR1

—

Bit 0

CP0

—

WRT0

—

EBTR0

—

 2010 Microchip Technology Inc.

DS39616D-page 279

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