PIC16F87-ISLASHML datasheet(131/214 Pages) MICROCHIP

131 / 214 page

 2003 Microchip Technology Inc.

Preliminary

DS30487B-page 129

PIC16F87/88

15.0

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:

• RESET

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Reset (BOR)

• Interrupts

• Watchdog Timer (WDT)

• Two-Speed Start-up

• Fail-Safe Clock Monitor

• SLEEP

• Code Protection

• ID Locations

• In-Circuit Serial Programming™ (ICSP™)

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.

Additional information on special features is available

in the PICmicro® Mid-Range Reference Manual

(DS33023).

15.1

Configuration Bits

The configuration bits can be programmed (read as

‘0’), or left unprogrammed (read as ‘1’), to select vari-

ous device configurations. These bits are mapped in

program memory locations 2007h and 2008h.

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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