PIC16LC620-04SLASHSS datasheet(45/108 Pages) MICROCHIP

45 / 108 page

Preliminary

DS30235G-page 45

PIC16C62X

9.0

SPECIAL FEATURES OF THE

CPU

Special circuits to deal with the needs of real time appli-

cations are what sets a microcontroller apart from other

processors. The PIC16C62X family has a host of such

features intended to maximize system reliability, mini-

mize 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)

Brown-out Reset (BOR)

Interrupts

Watchdog Timer (WDT)

SLEEP

Code protection

ID Locations

In-circuit serial programming

The PIC16C62X 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. There is also circuitry to reset the

device if a brown-out occurs which provides at least a

72 ms reset. With these three 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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