PIC16F5X datasheet(39/90 Pages) MICROCHIP

39 / 90 page

 2004 Microchip Technology Inc.

DS41213C-page 37

PIC16F5X

8.0

SPECIAL FEATURES OF THE

CPU

What sets a microcontroller apart from other proces-

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

time applications. The PIC16F5X family of microcon-

trollers have 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

• Device Reset Timer

• Watchdog Timer (WDT)

• Sleep

• Code protection

• User ID locations

• In-Circuit Serial Programming™ (ICSP™)

The PIC16F5X family 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. There is

an 18 ms delay provided by the Device Reset Timer

(DRT), intended to keep the chip in Reset until the

crystal oscillator is stable. With this timer 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 or through a Watchdog Timer

time-out. 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.

8.1

Configuration 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 for code protection for the

PIC16F5X devices (Register 8-1).

CONFIGURATION WORD FOR PIC16F5X

—

—CP

WDTE

FOSC1

FOSC0

bit 11

bit 0

bit 11-4:

Unimplemented: Read as ‘1’

bit 3:

CP: Code Protection bit.

= Code protection off

= Code protection on

bit 2:

WDTE: Watchdog Timer Enable bit

= WDT enabled

= WDT disabled

bit 1-0:

FOSC1:FOSC0: Oscillator Selection bits

= LP oscillator

= XT oscillator

= HS oscillator

= RC oscillator

Note 1: Refer to the PIC16F54, PIC16F57 and PIC16F59 Programming Specifications to determine how

to access the Configuration Word. These documents can be found on the Microchip web site at

www.microchip.com.

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = bit is set

‘0’ = bit is cleared

x = bit is unknown

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