PIC18F8720 datasheet(9/380 Pages) MICROCHIP

9 / 380 page

 2004 Microchip Technology Inc.

DS39609B-page 7

PIC18F6520/8520/6620/8620/6720/8720

1.0

DEVICE OVERVIEW

This document contains device specific information for

the following devices:

This family offers the same advantages of all PIC18

microcontrollers

–

namely,

high

computational

performance at an economical price – with the addition of

high endurance Enhanced Flash program memory. The

PIC18FXX20 family also provides an enhanced range of

program memory options and versatile analog features

that make it ideal for complex, high-performance

applications.

1.1

Key Features

1.1.1

EXPANDED MEMORY

The PIC18FXX20 family introduces the widest range of

on-chip, Enhanced Flash program memory available

on PICmicro® microcontrollers – up to 128 Kbyte (or

65,536 words), the largest ever offered by Microchip.

For users with more modest code requirements, the

family also includes members with 32 Kbyte or

64 Kbyte.

Other memory features are:

• Data RAM and Data EEPROM: The

PIC18FXX20 family also provides plenty of room

for application data. Depending on the device,

either 2048 or 3840 bytes of data RAM are

available. All devices have 1024 bytes of data

EEPROM for long-term retention of nonvolatile

data.

• Memory Endurance: The Enhanced Flash cells

for both program memory and data EEPROM are

rated to last for many thousands of erase/write

cycles – up to 100,000 for program memory and

1,000,000 for EEPROM. Data retention without

refresh is conservatively estimated to be greater

than 40 years.

1.1.2

EXTERNAL MEMORY INTERFACE

In the event that 128 Kbytes of program memory is

inadequate for

an application,

the PIC18F8X20

members of the family also implement an External

Memory Interface. This allows the controller’s internal

program counter to address a memory space of up to

2 Mbytes, permitting a level of data access that few

8-bit devices can claim.

With the addition of new operating modes, the External

Memory Interface offers many new options, including:

• Operating the microcontroller entirely from external

memory

• Using

combinations

on-chip

and

external

memory, up to the 2-Mbyte limit

• Using external Flash memory for reprogrammable

application code, or large data tables

• Using external RAM devices for storing large

amounts of variable data

1.1.3

EASY MIGRATION

Regardless of the memory size, all devices share the

same rich set of peripherals, allowing for a smooth

migration path as applications grow and evolve.

The consistent pinout scheme used throughout the

entire family also aids in migrating to the next larger

device. This is true when moving between the 64-pin

members, between the 80-pin members, or even

jumping from 64-pin to 80-pin devices.

1.1.4

OTHER SPECIAL FEATURES

• Communications: The PIC18FXX20 family

incorporates a range of serial communications

peripherals, including 2 independent USARTs and

a Master SSP module, capable of both SPI and

I2C (Master and Slave) modes of operation. For

PIC18F8X20 devices, one of the general purpose

I/O ports can be reconfigured as an 8-bit Parallel

Slave Port for direct processor-to-processor

communications.

• CCP Modules: All devices in the family

incorporate five Capture/Compare/PWM modules

to maximize flexibility in control applications. Up

to four different time bases may be used to

perform several different operations at once.

• Analog Features: All devices in the family

feature 10-bit A/D converters, with up to 16 input

channels, as well as the ability to perform

conversions during Sleep mode. Also included

are dual analog comparators with programmable

input and output configuration, a programmable

Low-Voltage Detect module and a programmable

Brown-out Reset module.

• Self-programmability: These devices can write

to their own program memory spaces under inter-

nal software control. By using a bootloader routine

located in the protected Boot Block at the top of

program memory, it becomes possible to create

an application that can update itself in the field.

• PIC18F6520

• PIC18F8520

• PIC18F6620

• PIC18F8620

• PIC18F6720

• PIC18F8720

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