PIC18F14K22-ESLASHML datasheet(27/388 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

Preliminary

DS41365D-page 27

PIC18F1XK22/LF1XK22

3.0

MEMORY ORGANIZATION

There are three types of memory in PIC18 Enhanced

microcontroller devices:

• Program Memory

• Data RAM

• Data EEPROM

As Harvard architecture devices, the data and program

memories use separate busses; this allows for concur-

rent access of the two memory spaces. The data

EEPROM, for practical purposes, can be regarded as

a peripheral device, since it is addressed and accessed

through a set of control registers.

Additional detailed information on the operation of the

Flash program memory is provided in Section 4.0

“Flash Program Memory”. Data EEPROM is

discussed separately in Section 5.0 “Data EEPROM

Memory”.

3.1

Program Memory Organization

PIC18 microcontrollers implement a 21-bit program

counter, which is capable of addressing a 2-Mbyte

Program Memory (PC) 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).

This family of devices contain the following:

• PIC18F13K22/LF13K22: 8 Kbytes of Flash Mem-

ory, up to 4,096 single-word instructions

• PIC18F14K22/LF14K22: 16 Kbytes of Flash Mem-

ory, up to 8,192 single-word instructions

PIC18 devices have two interrupt vectors and one

Reset vector. The Reset vector address is at 0000h

and the interrupt vector addresses are at 0008h and

0018h.

The program memory map for PIC18F1XK22/

LF1XK22 devices is shown in Figure 3-1. Memory

block details are shown in Figure 22-2.

FIGURE 3-1:

PROGRAM MEMORY MAP AND STACK FOR PIC18F1XK22/LF1XK22 DEVICES

PC<20:0>

Stack Level 1



Stack Level 31

Reset Vector

Low Priority Interrupt Vector



CALL,RCALL,RETURN

RETFIE,RETLW

0000h

0018h

High Priority Interrupt Vector

0008h

1FFFFFh

4000h

3FFFh

200000h

On-Chip

Program Memory

Read ‘0’

1FFFh

2000h

On-Chip

Program Memory

Read ‘0’

PIC18F14K22/

LF14K22

PIC18F13K22/

LF13K22

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