PIC18F87J10 Datasheet, PDF (57/394 Pages) Microchip Technology – 64/80-Pin High-Performance, 1-Mbit Flash Microcontrollers with nanoWatt Technology

PIC18F87J10 FAMILY
5.0 MEMORY ORGANIZATION
There are two types of memory in PIC18 Flash
microcontroller devices:
• Program Memory
• Data RAM
As Harvard architecture devices, the data and program
memories use separate busses; this allows for
concurrent access of the two memory spaces.
Additional detailed information on the operation of the
Flash program memory is provided in Section 6.0
“Program Memory”.
5.1 Program Memory Organization
PIC18 microcontrollers implement a 21-bit program
counter which is capable of addressing a 2-Mbyte
program memory space. Accessing a location between
the upper boundary of the physically implemented
memory and the 2-Mbyte address will return all ‘0’s (a
NOP instruction).
The entire PIC18F87J10 family offers a range of
on-chip Flash program memory sizes, from 32 Kbytes
(up to 16,384 single-word instructions) to 128 Kbytes
(65,536 single-word instructions). The program
memory maps for individual family members are shown
in Figure 5-3.
FIGURE 5-1:
MEMORY MAPS FOR PIC18F87J10 FAMILY DEVICES
CALL, CALLW, RCALL,
PC<20:0>
21
RETURN, RETFIE, RETLW,
ADDULNK, SUBULNK
Stack Level 1
•••
Stack Level 31
PIC18FX5J10
On-Chip
Memory
Config. Words
PIC18FX5J15
On-Chip
Memory
Config. Words
PIC18FX6J10
On-Chip
Memory
Config. Words
PIC18FX6J15
On-Chip
Memory
PIC18FX7J10
On-Chip
000000h
Memory
005FFFh
007FFFh
00BFFFh
00FFFFh
Config. Words
017FFFh
Config. Words _01FFFFh
Unimplemented Unimplemented Unimplemented Unimplemented _{Unimplemented}
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Note:
1FFFFFh
Sizes of memory areas are not to scale. Sizes of program memory areas are enhanced to show detail.
 2005 Microchip Technology Inc.
Advance Information
DS39663A-page 55