PIC18LF4520ESLASHSPQTP datasheet(10/390 Pages) MICROCHIP

10 / 390 page

PIC18F2420/2520/4420/4520

DS39631A-page 8

Preliminary

 2004 Microchip Technology Inc.

1.2

Other Special Features

• 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.

• 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.

• Extended Instruction Set: The PIC18F2420/

2520/4420/4520 family introduces an optional

extension to the PIC18 instruction set, which adds

8 new instructions and an Indexed Addressing

mode. This extension, enabled as a device con-

figuration option, has been specifically designed

to optimize re-entrant application code originally

developed in high-level languages, such as C.

• Enhanced CCP module: In PWM mode, this

module provides 1, 2 or 4 modulated outputs for

controlling half-bridge and full-bridge drivers.

Other features include Auto-Shutdown, for dis-

abling PWM outputs on interrupt or other select

conditions and Auto-Restart, to reactivate outputs

once the condition has cleared.

• 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. When the

microcontroller is using the internal oscillator

block, the USART provides stable operation for

applications that talk to the outside world without

using an external crystal (or its accompanying

power requirement).

• 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, reduce code overhead.

• Extended Watchdog Timer (WDT): This

enhanced version incorporates a 16-bit prescaler,

allowing an extended time-out range that is stable

across operating voltage and temperature. See

Section 26.0 “Electrical Characteristics” for

time-out periods.

1.3

Details on Individual Family

Members

Devices in the PIC18F2420/2520/4420/4520 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 five

ways:

Flash

program

memory

(16 Kbytes

for

PIC18F2420/4420 devices and 32 Kbytes for

PIC18F2520/4520).

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

40/44-pin devices).

I/O ports (3 bidirectional ports on 28-pin devices,

5 bidirectional ports on 40/44-pin devices).

CCP and Enhanced CCP implementation

(28-pin devices have 2 standard CCP mod-

ules, 40/44-pin devices have one standard CCP

module and one ECCP module).

Parallel Slave Port (present only 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

PIC18F2420/2520/4420/4520 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 PIC18F2420),

accommodate an operating VDD range of 4.2V to 5.5V.

Low-voltage parts, designated by “LF” (such as

PIC18LF2420), function over an extended VDD range

of 2.0V to 5.5V.

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