PIC16C925-SSLASHCL datasheet(99/182 Pages) MICROCHIP

99 / 182 page

 2001 Microchip Technology Inc.

Preliminary

DS39544A-page 97

PIC16C925/926

12.0

SPECIAL FEATURES OF THE

CPU

What sets a microcontroller apart from other proces-

sors are special circuits to deal with the needs of real

time applications. The PIC16CXXX family has a host of

such features, intended to maximize system reliability,

minimize cost through elimination of external compo-

nents, 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)

• SLEEP

• Code Protection

• ID Locations

• In-Circuit Serial Programming

The PIC16CXXX has 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 provides a fixed delay of 72 ms (nomi-

nal) on power-up only, 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 RC oscillator

option saves system cost, while the LP crystal option

saves power. A set of configuration bits are used to

select various options.

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 and can be accessed only dur-

ing programming.

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