PIC18F44J10-ESLASHSP datasheet(49/358 Pages) MICROCHIP

49 / 358 page

Preliminary

DS39682C-page 47

PIC18F45J10 FAMILY

5.0

MEMORY ORGANIZATION

There are two types of memory in PIC18 Enhanced

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 PIC18F24J10 and PIC18F44J10 each have

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

single-word

instructions.

The

PIC18F25J10

and

PIC18F45J10 each have 32 Kbytes of Flash memory

and can store up to 16,384 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 the PIC18F45J10 family

devices is shown in Figure 5-1.

FIGURE 5-1:

PROGRAM MEMORY MAP AND STACK FOR PIC18F45J10 FAMILY 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

PIC18FX4J10

PIC18FX5J10

8000h

7FFFh

On-Chip

Program Memory

Read ‘0’

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