PIC18LF4331-ESLASHML datasheet(279/392 Pages) MICROCHIP

279 / 392 page

 2010 Microchip Technology Inc.

DS39616D-page 279

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

TABLE 23-3:

SUMMARY OF CODE PROTECTION REGISTERS

File Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

300008h

CONFIG5L

—

—CP3(1)

CP2(1)

CP1

CP0

300009h

CONFIG5H

CPD

CPB

—

30000Ah

CONFIG6L

—

—WRT3(1)

WRT2(1)

WRT1

WRT0

30000Bh

CONFIG6H

WRTD

WRTB

WRTC

—

30000Ch

CONFIG7L

—

EBTR3(1) EBTR2(1)

EBTR1

EBTR0

30000Dh

CONFIG7H

—

EBTRB

—

Legend:

Shaded cells are unimplemented.

Note 1:

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

MEMORY SIZE/DEVICE

Block Code Protection

Controlled By:

8Kbytes

(PIC18F2331/4331)

Address

Range

16 Kbytes

(PIC18F2431/4431)

Address

Range

Boot Block

0000h

0FFFh

Boot Block

0000h

01FFh

CPB, WRTB, EBTRB

Block 0

0200h

0FFFh

Block 0

0200h

0FFFh

CP0, WRT0, EBTR0

Block 1

1000h

1FFFh

Block 1

1000h

1FFFh

CP1, WRT1, EBTR1

Unimplemented

Read ‘0’s

Block 2

2000h

2FFFh

CP2, WRT2, EBTR2

3FFFh

Block 3

3000h

3FFFh

CP3, WRT3, EBTR3

PIC18LF4331-E/ML Datasheet(PDF) 279 Page - Microchip Technology

PIC18LF4331-E/ML Datasheet(HTML) 279 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL