Intel 8253 is a programmable timer and it can be interfaced to 8085. This can be used as a real time clock, square wave generator and this is possible because 8253 can create accurate time delays.
The clock out frequency of an 8085 is one half the crystal frequency. The period of one T cycle is the inverse of the clock frequency. At a crystal frequency of 5MHz, the clock is 2.5MHz, and T is 400 ns.
If you have the Maximum clock frequency, then you can figure out the minimum clock period using this formula: 1/(minimum clock period) = (Maximum clock frequency).
How to make Low frequency clock generator using ANAD gates?
that depends on the microcontroller. check the datasheet.
We use clock signal in timing diagram because the microprocessor operates with reference to clock signals provided to it. At pins X1 and X2 we provide clock signals and this frequency is divided by two. This frequency is called as the operating frequency.
The 555 IC timer does not have a clock.
VHDL code for 8253 need to be written in structural modeling of VHDL. It will be a bunch of programs related to each and every component or functionality we use in 8253 and need to be combined. It is not a single program. It is a combination of several programs.
8300
The Young and the Restless - 1973 1-8253 was released on: USA: 1 November 2005
All My Children - 1970 1-8253 was released on: USA: 8 January 2002
It is a more accurate atomic clock that uses caesium atom frequency to measure time.