PIC16F7X7 datasheet(171/276 Pages) MICROCHIP

171 / 276 page

 2004 Microchip Technology Inc.

DS30498C-page 169

PIC16F7X7

15.0

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)

- Low-Voltage Detect (LVD)

• Interrupts

• Watchdog Timer (WDT)

• Two-Speed Start-up

• Fail-Safe Clock Monitor

• 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

oscillator 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).

15.1

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 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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