PIC16F74-ESLASHSS datasheet(91/174 Pages) MICROCHIP

91 / 174 page

 2002 Microchip Technology Inc.

DS30325B-page 89

PIC16F7X

12.0

SPECIAL FEATURES OF THE

CPU

These devices have a host of features intended to max-

imize system reliability, minimize cost through elimina-

tion of external components, provide power saving

operating modes and offer code protection. These are:

• Oscillator Selection

• RESET

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Reset (BOR)

• Interrupts

• Watchdog Timer (WDT)

• SLEEP

• Code Protection

• ID Locations

• In-Circuit Serial Programming

These devices have a Watchdog Timer, which can be

enabled or disabled, using a configuration bit. 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 (nomi-

nal) on power-up only. It is designed to keep the part in

RESET while the power supply stabilizes, and is

enabled or disabled, using a configuration bit. With

these two timers on-chip, most applications need no

external RESET circuitry.

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, or

through an interrupt.

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. Configuration bits are used to select the

desired oscillator mode.

Additional information on special features is available

in the PICmicro™ Mid-Range Reference Manual

(DS33023).

12.1

Configuration Bits

The configuration bits can be programmed (read as '0'),

or left unprogrammed (read as '1'), to select various

device configurations. These bits are mapped in pro-

gram memory location 2007h.

The user will note that address 2007h is beyond the

user program memory space, which can be accessed

only during programming.

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