PIC18F4321 datasheet(10/402 Pages) MICROCHIP

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PIC18F2221/2321/4221/4321 FAMILY

DS39689F-page 10

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 PIC18F2221/

2321/4221/4321 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

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/J2602 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 27.0 “Electrical Characteristics” for

time-out periods.

1.3

Details on Individual Family

Members

Devices in the PIC18F2221/2321/4221/4321 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

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 2 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

PIC18F2221/2321/4221/4321 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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