PIC12F635ESLASHST datasheet(113/196 Pages) MICROCHIP

113 / 196 page

Preliminary

DS41232B-page 111

PIC12F635/PIC16F636/639

12.0

SPECIAL FEATURES OF THE

CPU

The PIC12F635/PIC16F636/639 has a host of features

intended to maximize system reliability, minimize cost

through elimination of external components, provide

power saving features and offer code protection.

These features are:

• Reset

- Power-on Reset (POR)

- Wake-up Reset (WUR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Detect (BOD)

• Interrupts

• Watchdog Timer (WDT)

• Oscillator selection

• Sleep

• Code protection

• ID Locations

• In-Circuit Serial Programming

The PIC12F635/PIC16F636/639 has 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 nominal 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 12-1).

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