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thanks bunalmis this circuit is very useful
but do u have a circuit that doesnot use 4mhzfrequency or any another frequecy
i have a 12Mhz crystal can i devide it to 11.0592 to be used for 8051
thaks.
This circuit works by different crystal frequency.
I think you want 11.0592 Mhz for the serial communication unit of the 8051. Try the 12Mhz xtal, Probably 12Mhz work by standart baud rates. (But try to calculate the baud error for 12Mhz.)
Absolutely right bunalmis. The chip will almost certainly work fine at 12MHz, but the serial comms will not work with the standard division ratios, if the serial port is not needed there should not be a problem. Do not mess about with a non crystal clock for a microprocessor. If you have a 12MHz crystal it will probably work on the internal oscillator that is built into most 8051 devices, these usually need very few external components, see the datasheet for the microcontroller that you intend to use, these are amost all available for immediate download these days.
Best regards
Bob.
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