Friday, December 07, 2007
Wednesday, December 05, 2007
RS 232 tutorial - A very informative webpage - Recommended
Selecting and Using RS-232, RS-422, and RS-485 Serial Data Standards
An application note from Maxim semiconductors.Includes connection firures for RS232.422,485 and specifications
Dallas Semiconductor application note on RS232 - simple
RS422/485 application note
Sunday, December 02, 2007
Tuesday, November 27, 2007
- application note 287 :Switch Bounce and Other Dirty Little Secrets,Maxim semiconductors
- a guide to debouncing
- application note 287,Maxim semiconductors
- html format of the guide to debouncing
- MAX6816, MAX6817, MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers - Maxim/Dallas Semiconductor.
- MAX 6816,Max 6817,MAX6818 datasheet
Monday, November 26, 2007
see this wiki article .....
Sunday, November 25, 2007
The following document is a summary of some of these interfacing techniques
sorting algorithm animation
The name I2C translates into "Inter IC". The original communication speed was defined with a maximum of 100 kbit per second and many applications don't require faster transmissions. For those that do there is a 400 kbit and - since 1998 - a high speed 3.4 Mbit option available.
Meanwhile I2C is not only used on single boards, but also to connect components which are linked via cable. Simplicity and flexibility are key characteristics that make this bus especially attractive for consumer and automotive electronics.
to know more about I2C Bus---
The I2C-Bus and how to use it is a well-known document from Philips discussing the use of this bus in applications.
Reed Switches (wiki)
Reed Relay Applications
Sunday, November 18, 2007
Some web resources on Stepper Motors:
Stepper motor Basics
Control of Stepping Motors - A Tutorial
A Wiki article on Stepper motors
Nice Animation of a stepping Motor : A German webpage.Please use the slider labelled as continuous to vary speed and run the animation.The stepping modes can also be changed.The type of winding can be selected from the top left corner of the animation
Sunday, November 11, 2007
Friday, November 09, 2007
"CISC (complex Instruction Set Computer), with all the possible adressing modes on the instructions"
although the actual number of instructions is quite small!
So, taking the words at face-value, it is quite "simple" relative to something "complex" like a Pentium;
It is also quite "simple" relative to something like the ARM - which is RISC!
"CISC" and "RISC" have to do with design philosophy rather than raw counts of numbers of instructions...see the following discussion forum for more
Wednesday, November 07, 2007
- the status of 8051 port pins at power on/reset
- what happens when a 1 is written to a port latch
Sunday, November 04, 2007
Harvard architecture is a computer architecture with physically separate storage and signal pathways for instructions and data. The term originated from the Harvard Mark I relay-based computer, which stored instructions on punched tape (24 bits wide) and data in electro-mechanical counters (23 digits wide). These early machines had limited data storage, entirely contained within the data processing unit, and provided no access to the instruction storage as data, making loading and modifying programs an entirely offline process.
The following link also provides some insight into the topic especially wrt ARM cores
Sunday, January 14, 2007
Know more about cross compilers from this wiki article
Friday, January 05, 2007
Supervisory Circuits Keep Your Microprocessor Under Control
Maxim Semiconductor - APPLICATION NOTE 279
Discusses how the DS1232 can be used to MicroMonitor an 8051-based system. This supervisor circuit provides power-on-reset (POR), manual reset (push-button) input, a watchdog timer (strobe timer), and an early power-fail comparator. The reset threshold tolerance can set selected to monitor both 5% and 10% supply tolerance systems. In addition, a pin-selectable reset time-out delay is available.
To simplify the use of the device, a software execution program is included to show how the 8051 processor can be used in conjunction with the DS1232.