64GA106 datasheet(35/330 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS39905E-page 35

PIC24FJ256GA110 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

PIC24FJ256GA110 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 PIC24FJ256GA110 family of

devices are shown in Figure 4-1.

FIGURE 4-1:

PROGRAM SPACE MEMORY MAP FOR PIC24FJ256GA110 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

PIC24FJ128GA1XX

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

PIC24FJ192GA1XX

FF0000h

F7FFFEh

F80000h

Device Config Registers

800000h

7FFFFFh

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

PIC24FJ256GA1XX

Reserved

Flash Config Words

Unimplemented

Read ‘0’

015800h

0157FEh

020C00h

020BFEh

User Flash

Program Memory

(67K instructions)

User Flash

Program Memory

(44K instructions)

Reset Address

DEVID (2)

GOTO

Instruction

Reserved

Alternate Vector Table

Reserved

Interrupt Vector Table

PIC24FJ64GA1XX

Flash Config Words

Device Config Registers

Reserved

Unimplemented

Read ‘0’

User Flash

Program Memory

(22K instructions)

00ABFEh

00AC00h

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