PIC18F4520-I/P Microchip Technology Inc., PIC18F4520-I/P Datasheet - Page 265

• Manufacturer Part Number: PIC18F4520-I/P
• Description: 40 Pin, 32 KB Flash, 1536 RAM, 36 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4520-I/P

• A/d Inputs: 13-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• Programmable Memory: 32K Bytes
• Ram Size: 1.5K Bytes
• Speed: 40 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

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 2 Kbytes. The remainder
of the memory is divided into four blocks on binary
boundaries.
FIGURE 23-5:
TABLE 23-3:
 2004 Microchip Technology Inc.
300008h
300009h
30000Ah
30000Bh
30000Ch
30000Dh
Legend: Shaded cells are unimplemented.
Note 1:
2:
File Name
Program Verification and
Code Protection
®
devices.
Unimplemented in PIC18F2420/4420 devices; maintain this bit set.
Unimplemented in PIC18F2425/4425 devices; maintain this bit set.
CONFIG5L
CONFIG5H
CONFIG6L
CONFIG6H
CONFIG7L
CONFIG7H
(PIC18F2420/4420)
Unimplemented
SUMMARY OF CODE PROTECTION REGISTERS
16 Kbytes
Boot Block
Read ‘0’s
Block 0
Block 1
CODE-PROTECTED PROGRAM MEMORY FOR
PIC18F2420/2520/4420/4520
MEMORY SIZE/DEVICE
WRTD
Bit 7
CPD
—
—
—
—
EBTRB
(PIC18F2520/4520)
WRTB
Bit 6
CPB
Unimplemented
—
—
—
Boot Block
32 Kbytes
Read ‘0’s
Block 0
Block 1
Block 2
Block 3
PIC18F2420/2520/4420/4520
WRTC
Bit 5
Preliminary
—
—
—
—
—
000000h
0007FFh
000800h
001FFFh
002000h
003FFFh
004000h
005FFFh
006000h
007FFFh
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 16 and 32-Kbyte devices and the specific code pro-
tection bit associated with each block. The actual
locations of the bits are summarized in Table 23-3.
EBTR3
WRT3
(Unimplemented Memory Space)
CP3
Bit 3
—
—
—
Block Code Protection
(1,2)
CPB, WRTB, EBTRB
(1,2)
CP0, WRT0, EBTR0
CP1, WRT1, EBTR1
CP2, WRT2, EBTR2
CP3, WRT3, EBTR3
(1,2)
Controlled By:
EBTR2
WRT2
CP2
Bit 2
—
—
—
(1)
(1)
(1)
EBTR1
WRT1
Bit 1
CP1
DS39631A-page 263
—
—
—
EBTR0
WRT0
Bit 0
CP0
—
—
—