PIC16LC554 datasheet(35/96 Pages) MICROCHIP

35 / 96 page

Preliminary

DS40143B-page 35

PIC16C55X(A)

7.0

SPECIAL FEATURES OF THE

CPU

What sets

microcontroller apart from other

processors are special circuits to deal with the needs of

real time applications. The PIC16C55X(A) family has a

host of such features intended to maximize system

reliability, minimize cost through elimination of external

components, provide power saving operating modes

and offer code protection.

These are:

OSC selection

Reset

Power-on Reset (POR)

Power-up Timer (PWRT)

Oscillator Start-Up Timer (OST)

Interrupts

Watchdog Timer (WDT)

SLEEP

Code protection

ID Locations

In-circuit serial programming™

The PIC16C55X(A) has a Watchdog Timer which is

controlled by conﬁguration bits. It runs off its own RC

oscillator for added reliability. There are two timers that

offer necessary delays on power-up. One is the

Oscillator Start-up Timer (OST), intended to keep the

chip in reset until the crystal oscillator is stable. The

other is the Power-up Timer (PWRT), which provides a

ﬁxed delay of 72 ms (nominal) on power-up only,

designed to keep the part in reset while the power

supply stabilizes. With these two functions on-chip,

most applications need no external reset circuitry.

The SLEEP mode is designed to offer a very low

current power-down mode. The user can wake-up from

SLEEP through external reset, Watchdog Timer

wake-up or through an interrupt. 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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