PIC16C717T-E/SS【PDF 23/220 页】IC MCU OTP 2KX14 A/D PWM 20SSOP

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2002 Microchip Technology Inc.

DS41120B-page 117

PIC16C717/770/771

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)

Low-voltage detection

SLEEP

Code protection

ID locations

In-circuit serial programming (ICSP)

These devices have a Watchdog Timer, which can be

shut off only through configuration bits. 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 pro-

vides a fixed delay of 72 ms (nominal) on power-up

type RESETS only (POR, BOR), designed to keep the

part in RESET while the power supply stabilizes. 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 INTRC and ER oscillator options

save system cost while the LP crystal option saves

power. A set of configuration bits are used to select var-

ious options.

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 pro-

gram memory location 2007h.

The user will note that address 2007h is beyond the

user program memory space.

Some of the core features provided may not be neces-

sary to each application that a device may be used for.

The configuration word bits allow these features to be

configured/enabled/disabled as necessary. These fea-

tures include code protection, Brown-out Reset and its

trip point, the Power-up Timer, the watchdog timer and

the devices Oscillator mode. As can be seen in

have been provided for Brown-out Reset trip point

selection.

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