PIC18F26K22T-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F26K22T-I/ML

28/40/44-Pin, Low-Power,High-Performance Microcontrollers with XLP Technology

Microchip Technology 

PIC18(L)F2X/4XK22

24.3 Program Verification and

Code Protection

The overall structure of the code protection on the

PIC18 Flash devices differs significantly from other

PIC® microcontroller devices.

The user program memory is divided into three or five

blocks, depending on the device. One of these is a

Boot Block of 0.5K or 2K bytes, depending on the

device. The remainder of the memory is divided into

individual blocks on binary boundaries.

Each of the blocks has three code protection bits asso-

ciated with them. They are:

• Code-Protect bit (CPn)

• Write-Protect bit (WRTn)

• External Block Table Read bit (EBTRn)

Figure 24-2 shows the program memory organization

for 8, 16 and 32-Kbyte devices and the specific code

protection bit associated with each block. The actual

locations of the bits are summarized in Table .

FIGURE 24-2:

CODE-PROTECTED PROGRAM MEMORY FOR PIC18(L)F2X/4XK22

MEMORY SIZE/DEVICE

Block Code Protection

8 Kbytes

16 Kbytes

32 Kbytes

64 Kbytes

Controlled By:

(PIC18(L)FX3K22) (PIC18(L)FX4K22) (PIC18(L)FX5K22) (PIC18(L)FX6K22)

Boot Block

(000h-1FFh)

Block 0

(200h-FFFh)

Block 1

(1000h-1FFFh)

Boot Block

(000h-7FFh)

Block 0

(800h-1FFFh)

Block 1

(2000h-3FFFh)

Boot Block

(000h-7FFh)

Block 0

(800h-1FFFh)

Block 1

(2000h-3FFFh)

Block 2

(4000h-5FFFh)

Block 3

(6000h-7FFFh)

Boot Block

(000h-7FFh)

Block 0

(800h-3FFFh)

Block 1

(4000h-7FFFh)

Block 2

(8000h-BFFFh)

Block 3

(C000h-FFFFh)

CPB, WRTB, EBTRB

CP0, WRT0, EBTR0

CP1, WRT1, EBTR1

CP2, WRT2, EBTR2

CP3, WRT3, EBTR3

Unimplemented

Read ‘0’s

(2000h-1FFFFFh)

Unimplemented

Read ‘0’s

(4000h-1FFFFFh)

Unimplemented Unimplemented

Read ‘0’s

Read ‘0’s

(8000h-1FFFFFh) (10000h-1FFFFFh)

(Unimplemented

Memory Space)

TABLE 24-5: CONFIGURATION REGISTERS ASSOCIATED WITH CODE PROTECTION

File Name

Bit 7 Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

300008h CONFIG5L —

—

—

—

300009h CONFIG5H CPD

CPB

—

—

30000Ah CONFIG6L —

—

—

—

30000Bh CONFIG6H WRTD WRTB WRTC(2)

—

30000Ch CONFIG7L —

—

—

—

30000Dh CONFIG7H — EBTRB

—

—

Legend: Shaded bits are unimplemented.

CP3(1)

—

WRT3(1)

—

EBTR3(1)

—

CP2(1)

—

WRT2(1)

—

EBTR2(1)

—

CP1

—

WRT1

—

EBTR1

—

Note 1: Available on PIC18(L)FX5K22 and PIC18(L)FX6K22 devices only.

2: In user mode, this bit is read-only and cannot be self-programmed.

Bit 0

CP0

—

WRT0

—

EBTR0

—

DS41412A-page 364

Preliminary

 2010 Microchip Technology Inc.

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