Datasheet

 2010 Microchip Technology Inc. DS39622L-page 7
PIC18F2XXX/4XXX FAMILY
For PIC18FX4X0/X4X3 devices, the code memory
space extends from 000000h to 003FFFh (16 Kbytes)
in two 8-Kbyte blocks. Addresses, 000000h through
0003FFh, however, define a “Boot Block” region that is
treated separately from Block 0. All of these blocks
define code protection boundaries within the code
memory space.
TABLE 2-5: IMPLEMENTATION OF CODE
MEMORY
FIGURE 2-6: MEMORY MAP AND THE CODE MEMORY SPACE 
FOR PIC18FX4X0/X4X3 DEVICES
Device Code Memory Size (Bytes)
PIC18F2410
000000h-003FFFh (16K)
PIC18F2420
PIC18F2423
PIC18F2450
PIC18F4410
PIC18F4420
PIC18F4450
000000h
200000h
3FFFFFh
1FFFFFh
Note: Sizes of memory areas are not to scale.
Code Memory
Unimplemented
Read as ‘0’
Configuration
and ID
Space
MEMORY SIZE/
DEVICE
16 Kbytes
(PIC18FX4X0/X4X3)
Address
Range
Boot Block
000000h
0007FFh
Block 0
000800h
001FFFh
Block 1
002000h
003FFFh
Unimplemented
Reads all ‘0’s
004000h
005FFFh
006000h
007FFFh
1FFFFFh
008000h