参数资料
型号: PIC16C662T-04E/TQ
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PQFP44
封装: 10 X 10 MM, 1 MM HEIGHT, PLASTIC, TQFP-44
文件页数: 88/136页
文件大小: 634K
代理商: PIC16C662T-04E/TQ
1996 Microchip Technology Inc.
Preliminary
DS30559A-page 55
PIC16C64X & PIC16C66X
9.0
SPECIAL FEATURES OF THE
CPU
What
sets
apart
a
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:
1.
Oscillator selection
2.
Resets
Power-on Reset (POR)
Power-up Timer (PWRT)
Oscillator Start-up Timer (OST)
Brown-out Reset (BOR)
Parity Error Reset (PER)
3.
Interrupts
4.
Watchdog Timer (WDT)
5.
SLEEP
6.
Code protection
7.
ID Locations
8.
In-circuit serial programming
The PIC16C64X & PIC16C66X has a Watchdog Timer
which is enabled by a conguration 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 xed 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 t the application.
The RC oscillator option saves system cost while the
LP crystal option saves power. A set of conguration
bits are used to select various options.
This document was created with FrameMaker404
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