Applications of PICs

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2 Νοε 2013 (πριν από 3 χρόνια και 9 μήνες)

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Applications of
PICs


Advantages/disadvantages


Digital and analogue control


Loops, sub
-
routines, scanning, counting and feedback


Interrupts


Problems with interfacing to external devices


Structure of microprocessors


Applications of microprocessors in manufacturing


Programmable Integrated Circuit/Programmable Interface
Controller


Capable of storing instructions in the form of a programme


Can switch output devices on and off in sequence in
response to input signals


Can be programmed and erased up to 100,000 times


Require a supply voltage of 3 to 5.5V


Available as 8, 14, 18, 28 and 40 pin DIL packages


Applications include alarm systems, medical equipment,
vending machines, traffic lights, cash machines, petrol
pumps…..


Advantages


One PIC can replace a
wide variety of separate
electronic components
or circuits

Advantages


One PIC can replace a
wide variety of separate
electronic components
or circuits


Increase d product
reliability through the
use of less components

Advantages


One PIC can replace a
wide variety of separate
electronic components
or circuits


Increase d product
reliability through the
use of less components


Reduced stock levels

Advantages


One PIC can replace a wide
variety of separate
electronic components or
circuits


Increase d product
reliability through the use
of less components


Reduced stock levels


Simplified product
assembly and smaller end
products

Advantages


One PIC can replace a wide
variety of separate electronic
components or circuits


Increase d product reliability
through the use of less
components


Reduced stock levels


Simplified product assembly
and smaller end products


Greater product flexibility,
adaptability resulting in rapid
product changes

Advantages


One PIC can replace a wide
variety of separate electronic
components or circuits


Increase d product reliability
through the use of less
components


Reduced stock levels


Simplified product assembly
and smaller end products


Greater product flexibility,
adaptability resulting in rapid
product changes

Disadvantages

Advantages


One PIC can replace a wide
variety of separate electronic
components or circuits


Increase d product reliability
through the use of less
components


Reduced stock levels


Simplified product assembly
and smaller end products


Greater product flexibility,
adaptability resulting in rapid
product changes


Knowledge of programming
required

Disadvantages

Advantages


One PIC can replace a wide
variety of separate electronic
components or circuits


Increase d product reliability
through the use of less
components


Reduced stock levels


Simplified product assembly
and smaller end products


Greater product flexibility,
adaptability resulting in rapid
product changes


Knowledge of programming
required


PICs

have a low power output
and so require interfacing
circuitry to drive higher
current devices

Disadvantages

Microcontroller
diagrams

System diagrams can
still be used to
develop designs, but
the process element
would be replaced
with lines of
programme rather
than a list of
components

INPUT

PROCESS

OUTPUT

INPUT

PIC
MICROCONTROLLER

OUTPUT

For traditional electronics
this would require a variety
of components designed
through a circuit diagram

Although still requiring a
circuit, processing would be
programmed with all previous
components being replaced by
a single PIC

Inside a PIC

Like all computers, a
PIC micro controller
has a Central
Processing Unit,
Random Access
Memory, Read Only
Memory, a clock and
Input/Output ports.
The key difference is
that all of these are
built into one IC,
rather than a variety
of individual ICs

CPU

IO

RAM

ROM

FLASH


Most common form


Can be erased up to
100,000 times


Reprogrammed by
simply downloading the
new programme to the
IC


Offer flexibility to
manufactures


Can be programmed
only once


More suited to mass
produced products


One Time
Programmable (OTP)

Process

Decision

Input/Output

Terminator

Subroutine

Programming can be via a flow chart
sequence or BASIC programming
language

Intel Museum
-

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#1

How Do Microprocessors Work??