PIC18F4450-I/PT【PDF 2/241 页】IC PIC MCU FLASH 8KX16 44TQFP

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PIC18F2450/4450

DS39760D-page 8

2008 Microchip Technology Inc.

1.2

Other Special Features

Memory Endurance: The Enhanced Flash cells

for program memory are rated to last for many

thousands of erase/write cycles – up to 100,000.

Self-Programmability: These devices can write

to their own program memory spaces under

internal 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.

Extended Instruction Set: The PIC18F2450/

4450 family introduces an optional extension to

the PIC18 instruction set, which adds 8 new

instructions and an Indexed Literal Offset

Addressing mode. This extension, enabled as a

device configuration option, has been specifically

designed to optimize re-entrant application code

originally developed in high-level languages such

as C.

Enhanced Addressable USART: This serial

communication module is capable of standard

RS-232 operation and provides support for the LIN

bus protocol. Other enhancements include

Automatic Baud Rate Detection and a 16-bit Baud

Rate Generator for improved resolution.

10-Bit A/D Converter: This module incorporates

programmable acquisition time, allowing for a

channel to be selected and a conversion to be

initiated, without waiting for a sampling period and

thus, reducing code overhead.

Dedicated ICD/ICSP Port: These devices

introduce the use of debugger and programming

pins that are not multiplexed with other micro-

controller features. Offered as an option in select

packages, this feature allows users to develop I/O

intensive applications while retaining the ability to

program and debug in the circuit.

1.3

Details on Individual Family

Members

Devices in the PIC18F2450/4450 family are available

in 28-pin and 40/44-pin packages. Block diagrams for

the two groups are shown in Figure 1-1 and Figure 1-2.

The devices are differentiated from each other in the

following two ways:

A/D channels (10 for 28-pin devices, 13 for

40/44-pin devices).

I/O ports (3 bidirectional ports and 1 input only

port on 28-pin devices, 5 bidirectional ports on

40/44-pin devices).

All other features for devices in this family are identical.

These are summarized in Table 1-1.

The pinouts for all devices are listed in Table 1-2 and

Table 1-3.

Like all Microchip PIC18 devices, members of the

PIC18F2450/4450 family are available as both standard

and low-voltage devices. Standard devices with

Enhanced Flash memory, designated with an “F” in the

part number (such as PIC18F2450), accommodate an

operating VDD range of 4.2V to 5.5V. Low-voltage parts,

designated by “LF” (such as PIC18LF2450), function

over an extended VDD range of 2.0V to 5.5V.

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