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PIC18F2XK20/4XK20

DS41303G-page 12

2010 Microchip Technology Inc.

1.2

Other Special Features

Memory Endurance: The Flash cells for both

program memory and data EEPROM are rated to

last for many thousands of erase/write cycles – up to

10K for program memory and 100K 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 rou-

tine 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 PIC18F2XK20/

4XK20 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

- Auto-Restart, to reactivate outputs once the

condition has cleared

- Output steering to selectively enable one or

more of 4 outputs to provide the PWM signal.

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

postscaler, 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 PIC18F2XK20/4XK20 family are avail-

able 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

(8 Kbytes

for

PIC18F23K20/43K20 devices, 16 Kbytes for

PIC18F24K20/44K20 devices, 32 Kbytes for

PIC18F25K20/45K20

AND

64 Kbytes

for

PIC18F26K20/46K20).

A/D channels (11 for 28-pin devices, 14 for

40/44-pin devices).

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

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

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 the pin summary

tables: Table 1 and Table 2, and I/O description tables:

Table 1-2 and Table 1-3.

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