PIC18FXX20 Datasheet, PDF (42/366 Pages) Microchip Technology – 64/80-Pin High Performance 1 Mbit Enhanced FLASH Microcontrollers with A/D

PIC18FXX20
FIGURE 4-1:
INTERNAL PROGRAM MEMORY MAP AND STACK FOR PIC18FXX20 DEVICES
PC<20:0>
CALL,RCALL,RETURN
21
RETFIE,RETLW
Stack Level 1
•
•
•
Stack Level 31
000000h
000008h
000018h
On-Chip FLASH
Program Memory
007FFFh
008000h
000000h
000008h
000018h
On-Chip FLASH
Program Memory
00FFFFh
010000h
000000h
000008h
000018h
RESET Vector
High Priority
Interrupt Vector
Low Priority
Interrupt Vector
On-Chip FLASH
Program Memory
Read '0'
Read '0'
01FFFFh
020000h
Read '0'
PIC18FX520
(32 Kbyte)
1FFFFFh
200000h
PIC18FX620
(64 Kbyte)
1FFFFFh
200000h
Note: Size of memory regions not to scale.
PIC18FX720
(128 Kbyte)
1FFFFFh
200000h
TABLE 4-1: MEMORY ACCESS FOR PIC18F8X20 PROGRAM MEMORY MODES
Operating Mode
Microprocessor
Microprocessor
w/ Boot Block
Microcontroller
Extended
Microcontroller
Internal Program Memory
Execution
From
Table Read
From
Table Write To
No Access
Yes
No Access
Yes
No Access
Yes
Yes
Yes
Yes
Yes
Yes
Yes
External Program Memory
Execution
From
Table Read
From
Table Write To
Yes
Yes
Yes
Yes
Yes
Yes
No Access
Yes
No Access
Yes
No Access
Yes
DS39609A-page 40
Advance Information
 2003 Microchip Technology Inc.