PIC12F519 datasheet(39/96 Pages) MICROCHIP

39 / 96 page

DS41319B-page 37

PIC12F519

8.0

SPECIAL FEATURES OF THE

CPU

What sets a microcontroller apart from other processors

are special circuits that deal with the needs of real-time

applications. The PIC12F519 microcontroller has a host

of such features intended to maximize system reliability,

minimize

cost

through

elimination

external

components, provide power-saving operating modes

and offer code protection. These features are:

• Oscillator Selection

• Reset:

- Power-on Reset (POR)

- Device Reset Timer (DRT)

- Wake-up from Sleep on Pin Change

• Watchdog Timer (WDT)

• Sleep

• Code Protection

• ID Locations

• In-Circuit Serial Programming™

The PIC12F519 device has a Watchdog Timer, which

can be shut off only through Configuration bit WDTE. It

runs off of its own RC oscillator for added reliability. If

using XT or LP selectable oscillator options, there is

always an 18 ms (nominal) delay provided by the

Device Reset Timer (DRT), intended to keep the chip in

Reset until the crystal oscillator is stable. If using INTRC

or EXTRC, the DRT provides a 1 ms (nominal) delay.

The Sleep mode is designed to offer a very low-current

Power-Down mode. The user can wake-up from Sleep

through a change-on-input-pins or through a Watchdog

Timer time-out. Several oscillator options are also made

available to allow the part to fit the application, including

an internal 4 MHz or 8 MHz oscillator. The EXTRC

oscillator option saves system cost while the LP crystal

option saves power. A set of Configuration bits are used

to select various options.

8.1

Configuration Bits

The PIC12F519 Configuration Words consist of 12 bits.

Configuration bits can be programmed to select various

device configurations. Two bits are for the selection of

the oscillator type; one bit is the Watchdog Timer enable

bit, one bit is the MCLR enable bit and one bit is for code

protection (Register 8-1).

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