PIC16F570 datasheet(37/134 Pages) MICROCHIP

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 2012-2014 Microchip Technology Inc.

DS40001652C-page 37

PIC16F527

8.0

SPECIAL FEATURES OF THE

CPU

What sets a microcontroller apart from other

processors are special circuits that deal with the needs

real-time

applications.

The

PIC16F527

microcontrollers 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 (POR)

- Brown-out Reset (BOR)

- Device Reset Timer (DRT)

- Wake-up from Sleep on Pin Change

• Interrupts

• Automatic Context Saving

• Watchdog Timer (WDT)

• Sleep

• Code Protection

• ID Locations

• In-Circuit Serial Programming™

•Clock Out

The device has a Watchdog Timer, which can be shut

off only through Configuration bit WDTE. The

Watchdog Timer runs off of its own RC oscillator for

added reliability.

There is also a Device Reset Timer (DRT), intended to

keep the chip in Reset until the crystal oscillator is

stable. The DRT can be enabled with the DRTEN

Configuration bit. For the HS, XT or LP oscillator

options, the 18 ms (nominal) delay is always provided

by the Device Reset Timer and the DRTEN bit is

ignored. When using the EC clock, INTRC or EXTRC

oscillator options, there is a standard delay of 10 us on

power-up, which can be extended to 18 ms with the

use of the DRT timer. With the DRT timer on-chip,

most applications require no additional 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 a change on input pin or through a Watchdog

Timer time-out. Several oscillator options are also

made available to allow the part to fit the application,

including an internal 4/8 MHz oscillator. The EXTRC

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

The PIC16F527 Configuration Words consist of 12 bits,

although some bits may be unimplemented and read as

‘1’. Configuration bits can be programmed to select

various device configurations (see Register 8-1).

Note:

For QTP and SQTP code applications, if

the device is configured such that the

Internal Oscillator is selected and the

MCLRE fuse is cleared, it is possible for

code to execute when memory is verified

in ICSP™ mode. If customer code writes

to Flash data memory, the potential exists

for corruption of addresses 400h to 43Fh

during code verification. In this configura-

tion, Flash data memory should be erased

in code prior to being written in code.

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