PIC16F690-ISLASHSSSQTP datasheet(195/294 Pages) MICROCHIP

195 / 294 page

DS41262D-page 193

PIC16F631/677/685/687/689/690

14.0

SPECIAL FEATURES OF THE

CPU

The PIC16F631/677/685/687/689/690 have a host of

features intended to maximize system reliability,

minimize cost through elimination of external compo-

nents, provide power saving features and offer code

protection.

These features are:

• Reset

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Reset (BOR)

• Interrupts

• Watchdog Timer (WDT)

• Oscillator selection

• Sleep

• Code protection

• ID Locations

• In-Circuit Serial Programming

The PIC16F631/677/685/687/689/690 have 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 64 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 can use the Power-

up Timer to provide at least a 64 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

• An interrupt

Several oscillator options are also made available to

allow the part to fit the application. The INTOSC option

saves system cost while the LP crystal option saves

power. A set of Configuration bits are used to select

various options (see Register 14-2).

PIC16F690-I/SSSQTP Datasheet(PDF) 195 Page - Microchip Technology

PIC16F690-I/SSSQTP Datasheet(HTML) 195 Page - Microchip Technology

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