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2002 Microchip Technology Inc.

Preliminary

DS30453D-page 43

PIC16C5X

9.0

SPECIAL FEATURES OF THE

CPU

What sets a microcontroller apart from other proces-

sors are special circuits that deal with the needs of real-

time applications. The PIC16C5X family of microcon-

trollers have a host of such features intended to maxi-

mize

system

reliability,

minimize

cost

through

elimination of external components, provide power sav-

ing operating modes and offer code protection. These

features are:

Oscillator Selection (Section 4.0)

RESET (Section 5.0)

Power-On Reset (Section 5.1)

Device Reset Timer (Section 5.2)

Watchdog Timer (WDT) (Section 9.2)

SLEEP (Section 9.3)

Code protection (Section 9.4)

ID locations (Section 9.5)

The PIC16C5X Family has a Watchdog Timer which

can be shut off only through configuration bit WDTE. It

runs off of its own RC oscillator for added reliability.

There is an 18 ms delay provided by the Device Reset

Timer (DRT), intended to keep the chip in RESET until

the crystal oscillator is stable. With this timer on-chip,

most applications need no external RESET circuitry.

The SLEEP mode is designed to offer a very low cur-

rent Power-down mode. The user can wake up from

SLEEP through external RESET or through a Watch-

dog Timer time-out. Several oscillator options are also

made available to allow the part to fit the application.

The RC oscillator option saves system cost while the

LP crystal option saves power. A set of configuration

bits are used to select various options.

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