08-01-2013, 12:00 PM
Embedded systemOn Industrial training
Embedded system.pptx (Size: 1.4 MB / Downloads: 44)
Definition of Embedded System
Embedded Systems are the Microprocessor / Microcontroller based computing/control systems which are designed for specific task. Ex-Automatic Washing Machines, Robots, Electronic Cash Register, Mobile Phones etc. Every Device is converting into automotive, there is the role of Embedded Technology.
Application Areas
Consumer Appliances
Office Automation
Industrial Automation
Medical & Bio-Metrics
Computer Networking
Telecommunication
Instrumentation
Security & Survillance
Automobiles
Military applications
Satellites & Geo-Applications
Von-Neumann Machine
A Von-Neumann Machine, in contrast to the Harvard Architecture provides one data path (bus) for both instruction and data
Other than less complexity of hardware, it allows for using a single, sequential memory.
Modern processors employ a Harvard Architecture to read from two instruction and data caches, when at the same time using a Von-Neumann Architecture to access external memory
Timers/Counters
General 8051 has 2 timer:
Two 16-bit timer
The counters are divided into two 8-Bit registers called the timer low (TL0, TL1) and high (TH0, TH1) bytes.
All counters action is controlled by bit states in the timer mode control register (TMOD), the timer/counter control register (TCON), and certain program instructions.