PIC16C641-04SLASHTQ datasheet(55/136 Pages) MICROCHIP

55 / 136 page

Preliminary

DS30559A-page 55

PIC16C64X & PIC16C66X

9.0

SPECIAL FEATURES OF THE

CPU

What

sets

apart

microcontroller

from

other

processors are special circuits to deal with the needs of

real-time applications. The PIC16C64X & PIC16C66X

families have a host of such 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

Resets

Power-on Reset (POR)

Power-up Timer (PWRT)

Oscillator Start-up Timer (OST)

Brown-out Reset (BOR)

Parity Error Reset (PER)

Interrupts

Watchdog Timer (WDT)

SLEEP

Code protection

ID Locations

In-circuit serial programming

The PIC16C64X & PIC16C66X has a Watchdog Timer

which is enabled by a conﬁguration bit (WDTE). 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 sta-

ble. The other is the Power-up Timer (PWRT), which

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

only, designed to keep the part in reset while the power

supply stabilizes. Circuitry has been provided for

checking program memory parity with a reset when an

error is indicated. There is also circuitry to reset the

device if a brown-out occurs which provides at least a

72 ms reset. With these three functions 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.

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