PIC18F4321 datasheet(10/396 Pages) MICROCHIP

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PIC18F4321 FAMILY

DS39689E-page 8

Preliminary

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 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 PIC18F4321

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 configuration

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

disabling 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 EUSART 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, reducing 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.

• 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 PIC18F4321 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

(4 Kbytes

for

PIC18F2221/4221

devices,

8 Kbytes

for

PIC18F2321/4321).

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

standard

CCP

modules, 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

PIC18F4321 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 PIC18F2321), accommodate an

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

parts, designated by “LF” (such as PIC18LF2321),

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

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