PIC18F2220 MICROCHIP [Microchip Technology], PIC18F2220 Datasheet - Page 253

• Manufacturer Part Number: PIC18F2220
• Description: 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

23.5
The overall structure of the code protection on the
PIC18 Flash devices differs significantly from other
PICmicro
The user program memory is divided into five blocks.
One of these is a boot block of 512 bytes. The remain-
der of the memory is divided into four blocks on binary
boundaries.
FIGURE 23-5:
TABLE 23-3:
 2003 Microchip Technology Inc.
300008h
300009h
30000Ah
30000Bh
30000Ch
30000Dh
Legend:
File Name
Program Verification and
Code Protection
®
(PIC18F2220/4220)
devices.
Shaded cells are unimplemented.
Unimplemented
Unimplemented
Unimplemented
CONFIG5L
CONFIG5H
CONFIG7L
CONFIG7H
CONFIG6L
CONFIG6H
Boot Block
4 Kbytes
Read ‘0’s
Read ‘0’s
Read ‘0’s
Block 0
Block 1
SUMMARY OF CODE PROTECTION REGISTERS
MEMORY SIZE/DEVICE
CODE-PROTECTED PROGRAM MEMORY FOR PIC18F2X20/4X20
WRTD
Bit 7
CPD
—
—
—
—
(PIC18F2320/4320)
Unimplemented
EBTRB
WRTB
Boot Block
Bit 6
CPB
8 Kbytes
Read ‘0’s
Block 0
Block 1
Block 2
Block 3
—
—
—
PIC18F2220/2320/4220/4320
WRTC
Bit 5
—
—
—
—
—
000000h
0001FFh
000200h
0007FFh
000800h
000FFFh
001000h
0017FFh
001800h
001FFFh
002000h
1FFFFFh
Address
Range
Bit 4
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 4 and 8-Kbyte devices and the specific code protec-
tion bit associated with each block. The actual locations
of the bits are summarized in Table 23-3.
—
—
—
—
—
—
EBTR3
WRT3
Bit 3
CP3
(Unimplemented Memory Space)
—
—
—
Block Code Protection
CPB, WRTB, EBTRB
CP0, WRT0, EBTR0
CP1, WRT1, EBTR1
CP2, WRT2, EBTR2
CP3, WRT3, EBTR3
Controlled By:
EBTR2
WRT2
Bit 2
CP2
—
—
—
EBTR1
WRT1
Bit 1
CP1
—
—
—
DS39599C-page 251
EBTR0
WRT0
Bit 0
CP0
—
—
—