PIC16F628 datasheet(93/170 Pages) MICROCHIP

93 / 170 page

 2003 Microchip Technology Inc.

Preliminary

DS40300C-page 91

PIC16F62X

14.0 SPECIAL FEATURES OF THE

CPU

Special circuits to deal with the needs of real-time

applications are what sets a microcontroller apart from

other processors. The PIC16F62X family has a host of

such features intended to maximize system reliability,

minimize

cost

through

elimination

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 (BOD)

Interrupts

Watchdog Timer (WDT)

SLEEP

10. Code protection

11. ID Locations

12. In-circuit Serial Programming

The PIC16F62X has a Watchdog Timer which is

controlled by 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 (nominal) on power-up only,

designed to keep the part in RESET while the power

supply stabilizes. 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.

The 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 ER oscillator option saves system

cost while the LP crystal option saves power. A set of

configuration bits are used to select various options.

14.1

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

program memory location 2007h.

The user will note that address 2007h is beyond

the user program memory space. In fact, it belongs

to the special configuration memory space (2000h –

3FFFh),

which

can

accessed

only

during

programming. See Programming Specification.

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