12F629 datasheet(53/136 Pages) MICROCHIP

53 / 136 page

 2010 Microchip Technology Inc.

DS41190G-page 53

PIC12F629/675

9.0

SPECIAL FEATURES OF THE

CPU

Certain special circuits that deal with the needs of real

time applications are what sets a microcontroller apart

from other processors. The PIC12F629/675 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 features are:

• Oscillator selection

• Reset

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Detect (BOD)

• Interrupts

• Watchdog Timer (WDT)

• Sleep

• Code protection

• ID Locations

• In-Circuit Serial Programming

The PIC12F629/675 has a Watchdog Timer that 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 can provide 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

• 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 9.2).

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