PIC18LC242-ESLASHP datasheet(33/296 Pages) MICROCHIP

Part #	PIC18LC242-E/P

Description	High-Performance Microcontrollers with 10-Bit A/D

PDF	296 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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33 / 296 page

PIC18CXX2

Preliminary

DS39026B-page 33

4.0

MEMORY ORGANIZATION

There are two memory blocks in Enhanced MCU

devices. These memory blocks are:

• Program Memory

• Data Memory

Each block has its own bus so that concurrent access

can occur.

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

2-Mbyte address will cause a read of all ’0’s (a NOP

instruction).

PIC18C252 and PIC18C452 have 32-KBytes of

EPROM, while PIC18C242 and PIC18C442 have

16-KBytes of EPROM. This means that PIC18CX52

devices can store up to 16K of single word instruc-

tions, and PIC18CX42 devices can store up to 8K of

single word instructions.

The reset vector address is at 0000h and the interrupt

vector addresses are at 0008h and 0018h.

Figure 4-1 shows the Program Memory Map for

PIC18C242/442 devices and Figure 4-2 shows the

Program Memory Map for PIC18C252/452 devices.

PIC18LC242-E/P Datasheet(PDF) 33 Page - Microchip Technology