PIC24H datasheet(25/290 Pages) MICROCHIP

25 / 290 page

Preliminary

DS70175D-page 25

PIC24H

3.0

MEMORY ORGANIZATION

The PIC24H architecture features separate program

and data memory spaces and buses. This architecture

also allows the direct access of program memory from

the data space during code execution.

3.1

Program Address Space

The program address memory space of the PIC24H

devices is 4M instructions. The space is addressable by a

24-bit value derived from either the 23-bit Program Counter

(PC) during program execution, or from table operation

or data space remapping as described in Section 3.4

“Interfacing Program and Data Memory Spaces”.

User access to the program memory space is restricted

to the lower half of the address range (0x000000 to

0x7FFFFF). 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 PIC24H family of devices are

shown in Figure 3-1.

FIGURE 3-1:

PROGRAM MEMORY MAP FOR PIC24H FAMILY DEVICES

Note:

This data sheet summarizes the features

of this group of PIC24H devices. It is not

intended to be a comprehensive reference

source. To complement the information in

this data sheet, refer to the “dsPIC30F

Family Reference Manual” (DS70046).

Reset Address

0x000000

0x0000FE

0x000002

0x000100

Device Configuration

User Program

Flash Memory

0x00AC00

0x00ABFE

(22K instructions)

0x800000

0xF80000

Registers

0xF80017

0xF80010

DEVID (2)

0xFEFFFE

0xFF0000

0xFFFFFE

0xF7FFFE

Unimplemented

(Read ‘0’s)

GOTO

Instruction

0x000004

Reserved

0x7FFFFE

Reserved

0x000200

0x0001FE

0x000104

Alternate Vector Table

Reserved

Interrupt Vector Table

Reset Address

Device Configuration

Registers

DEVID (2)

Unimplemented

(Read ‘0’s)

GOTO

Instruction

Reserved

Alternate Vector Table

Reserved

Interrupt Vector Table

Reset Address

Device Configuration

User Program

Flash Memory

(88K instructions)

Registers

DEVID (2)

GOTO

Instruction

Reserved

Alternate Vector Table

Reserved

Interrupt Vector Table

PIC24HJ64XXXXX

PIC24HJ128XXXXX

PIC24HJ256XXXXX

0x015800

0x0157FE

User Program

(44K instructions)

Flash Memory

(Read ‘0’s)

Unimplemented

0x02AC00

0x02ABFE

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