PIC18F2610ESLASHSOSQTP datasheet(53/376 Pages) MICROCHIP

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DS39636D-page 55

PIC18F2X1X/4X1X

5.0

MEMORY ORGANIZATION

There are two types of memory in PIC18F2X1X/4X1X

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

“Flash 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 PIC18F2410/4410 and PIC18F2510 each have

16 Kbytes of Flash memory and can store up to 8,192

single-word instructions. The PIC18F2510/4510 each

have 32 Kbytes of Flash memory and can store up to

16,384 single-word instructions. The PIC18F2515/4515

each have 48 Kbytes of Flash memory and can store up

to 24,576 single-word instructions. The PIC18F2610/

4610 each have 64 Kbytes of Flash memory and can

store up to 32,768 single-word instructions.

PIC18 devices have two interrupt vectors. The Reset

vector address is at 0000h and the interrupt vector

addresses are at 0008h and 0018h.

The program memory map for PIC18F2X1X/4X1X

devices is shown in Figure 5-1.

FIGURE 5-1:

PROGRAM MEMORY MAP AND STACK FOR

PIC18F2X1X/4X1X DEVICES

PC<20:0>

Stack Level 1

•

Stack Level 31

Reset Vector

Low Priority Interrupt Vector

•

CALL,RCALL,RETURN

RETFIE,RETLW

00000h

00018h

On-Chip

Program Memory

High Priority Interrupt Vector

00008h

1FFFFFh

Read ‘0’

200000h

08000h

07FFFh

0C000h

0BFFFh

On-Chip

Program Memory

Read ‘0’

On-Chip

Program Memory

Read ‘0’

10000h

04000h

03FFFh

On-Chip

Program Memory

Read ‘0’

0FFFFh

PIC18F2410/4410

(16 Kbytes)

(32 Kbytes)

(48 Kbytes)

(64 Kbytes)

PIC18F2510/4510

PIC18F2515/4515

PIC18F2610/4610

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