Datasheet

 2009 Microchip Technology Inc. DS39897C-page 39
PIC24FJ256GB110 FAMILY
4.0 MEMORY ORGANIZATION
As Harvard architecture devices, PIC24F micro-
controllers feature separate program and data memory
spaces and busses. This architecture also allows the
direct access of program memory from the data space
during code execution.
4.1 Program Address Space
The program address memory space of the
PIC24FJ256GB110 family devices is 4M instructions.
The space is addressable by a 24-bit value derived
from either the 23-bit Program Counter (PC) during pro-
gram execution, or from table operation or data space
remapping, as described in Section 4.3 “Interfacing
Program and Data Memory Spaces”.
User access to the program memory space is restricted
to the lower half of the address range (000000h to
7FFFFFh). The exception is the use of TBLRD/TBLWT
operations which use TBLPAG<7> to permit access to
the Configuration bits and Device ID sections of the
configuration memory space.
Memory maps for the PIC24FJ256GB110 family of
devices are shown in Figure 4-1.
FIGURE 4-1: PROGRAM SPACE MEMORY MAP FOR PIC24FJ256GB110 FAMILY DEVICES
000000h
0000FEh
000002h
000100h
F8000Eh
F80010h
FEFFFEh
FFFFFFh
000004h
000200h
0001FEh
000104h
Reset Address
DEVID (2)
GOTO Instruction
Reserved
Alternate Vector Table
Reserved
Interrupt Vector Table
PIC24FJ128GB1XX
Configuration Memory Space
User Memory Space
Flash Config Words
Note: Memory areas are not shown to scale.
Reset Address
Device Config Registers
DEVID (2)
GOTO Instruction
Reserved
Alternate Vector Table
Reserved
Interrupt Vector Table
PIC24FJ192GB1XX
FF0000h
F7FFFEh
F80000h
Device Config Registers
800000h
7FFFFFh
Reserved
Reserved
Flash Config Words
02AC00h
02ABFEh
Unimplemented
Read ‘0’
Unimplemented
Read ‘0’
Reset Address
Device Config Registers
User Flash
Program Memory
(87K instructions)
DEVID (2)
GOTO Instruction
Reserved
Alternate Vector Table
Reserved
Interrupt Vector Table
PIC24FJ256GB1XX
Reserved
Flash Config Words
Unimplemented
Read ‘0’
Reset Address
DEVID (2)
GOTO Instruction
Reserved
Alternate Vector Table
Reserved
Interrupt Vector Table
PIC24FJ64GB1XX
Flash Config Words
Device Config Registers
Reserved
Unimplemented
Read ‘0’
015800h
0157FEh
00AC00h
00ABFEh
User Flash
Program Memory
(22K instructions)
020C00h
020BFEh
User Flash
Program Memory
(67K instructions)
User Flash
Program Memory
(44K instructions)