PIC16F818-ESLASHML datasheet(91/176 Pages) MICROCHIP

91 / 176 page

 2004 Microchip Technology Inc.

DS39598E-page 89

PIC16F818/819

12.0

SPECIAL FEATURES OF

THE CPU

These devices have a host of features intended to

maximize system reliability, minimize cost through elimi-

nation of external components, provide power-saving

operating modes and offer code protection:

• 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

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 oscil-

lator is stable. The other is the Power-up Timer (PWRT)

which provides a fixed delay of 72 ms (nominal) 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 MCU Family 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 program 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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