PIC16F872SLASHSP datasheet(95/160 Pages) MICROCHIP

95 / 160 page

Preliminary

DS30221A-page 95

PIC16F872

11.0

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:

• OSC 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

• Low Voltage In-Circuit Serial Programming

• In-Circuit Debugger

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

only. It is 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.

Additional information on special features is available

in the PICmicro™ Mid-Range Reference Manual,

(DS33023).

11.1

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. In fact, it belongs to the

special

test/configuration

memory

space

(2000h

through 3FFFh), which can be accessed only during

programming.

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