PIC16C620A-04I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C620A-04I/SO

EPROM-Based 8-Bit CMOS Microcontrollers

Microchip Technology 

9.0 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 PIC16C62X 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:

1. OSC selection

2. RESET

Power-on Reset (POR)

Power-up Timer (PWRT)

Oscillator Start-up Timer (OST)

Brown-out Reset (BOR)

3. Interrupts

4. Watchdog Timer (WDT)

5. SLEEP

6. Code protection

7. ID Locations

8. In-Circuit Serial Programming™

PIC16C62X

The PIC16C62X devices have 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 pro-

vides 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 RC oscillator option saves system

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

configuration bits are used to select various options.

 2003 Microchip Technology Inc.

DS30235J-page 45

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