PIC18F4539-ESLASHP datasheet(35/322 Pages) MICROCHIP

35 / 322 page

 2002 Microchip Technology Inc.

Preliminary

DS30485A-page 33

PIC18FXX39

4.0

MEMORY ORGANIZATION

There are three memory blocks in Enhanced MCU

devices. These memory blocks are:

• Program Memory

• Data RAM

• Data EEPROM

Data and program memory use separate busses,

which allows for concurrent access of these blocks.

Additional detailed information for FLASH program

memory and Data EEPROM is provided in Section 5.0

and Section 6.0, respectively.

4.1

Program Memory Organization

A 21-bit program counter is capable of addressing the

2-Mbyte program memory space. Accessing a location

between the physically implemented memory and the

top of the 2-MByte range will cause a read of all ‘0’s (a

NOP

instruction).

The PIC18F2539 and PIC18F4539 each have a total of

24 Kbytes, or 12K of single word instructions of FLASH

memory, from addresses 0000h to 5FFFh. The next

8 Kbytes beyond this space (from 6000h to 7FFFh) are

reserved for the Motor Control kernel; accessing

locations in this range will return random information.

The PIC18F2439 and PIC18F4439 each have

12 Kbytes, or 6K of single word instructions of FLASH

memory, from addresses 0000h to 2FFFh. The next

4 Kbytes of this space (from 3000h to 3FFFh) are

reserved for the Motor Control kernel; accessing

locations in this range will return random information.

The RESET vector address for all devices is at 0000h,

and the interrupt vector addresses are at 0008h and

0018h.

The memory maps for the PIC18FX439 and

PIC18FX539 devices are shown in Figure 4-1.

FIGURE 4-1:

PROGRAM MEMORY MAP AND STACK FOR PIC18FXX39 DEVICES

Note:

The ProMPT Motor Control kernel is iden-

tical for all PIC18FXX39 devices, regard-

less of the difference in reserved block size

between PIC18FX439 and PIC18FX539

devices

PC<20:0>

Stack Level 1

•

Stack Level 31

RESET Vector

Low Priority Interrupt Vector

•

CALL,RCALL,RETURN

RETFIE,RETLW

0000h

0018h

On-Chip

Program Memory

High Priority Interrupt Vector 0008h

1FFFFFh

4000h

3FFFh

Read '0'

200000h

3000h

2FFFh

Reserved

RESET Vector

Low Priority Interrupt Vector

0000h

0018h

8000h

7FFFh

On-Chip

Program Memory

High Priority Interrupt Vector 0008h

Read '0'

1FFFFFh

200000h

Note:

Size of memory areas not to scale.

PIC18FX439 Devices

PIC18FX539 Devices

Reserved

6000h

5FFFh

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