PIC18F23K20-ESLASHML datasheet(299/456 Pages) MICROCHIP

299 / 456 page

 2010 Microchip Technology Inc.

DS41303G-page 299

PIC18F2XK20/4XK20

23.0

SPECIAL FEATURES OF

THE CPU

PIC18F2XK20/4XK20 devices include several features

intended to maximize reliability and minimize cost through

elimination of external components. These are:

• Oscillator Selection

• Resets:

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Reset (BOR)

• Interrupts

• Watchdog Timer (WDT)

• Code Protection

• ID Locations

• In-Circuit Serial Programming™

The oscillator can be configured for the application

depending on frequency, power, accuracy and cost. All

of the options are discussed in detail in Section 2.0

“Oscillator Module (With Fail-Safe Clock Monitor)”.

A complete discussion of device Resets and interrupts

is available in previous sections of this data sheet.

In addition to their Power-up and Oscillator Start-up

Timers provided for Resets, PIC18F2XK20/4XK20

devices have a Watchdog Timer, which is either

permanently enabled via the Configuration bits or

software controlled (if configured as disabled).

The inclusion of an internal RC oscillator also provides

the additional benefits of a Fail-Safe Clock Monitor

(FSCM) and Two-Speed Start-up. FSCM provides for

background monitoring of the peripheral clock and

automatic switchover in the event of its failure. Two-

Speed Start-up enables code to be executed almost

immediately on start-up, while the primary clock source

completes its start-up delays.

All of these features are enabled and configured by

setting the appropriate Configuration register bits.

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