Explain 8253 microprocessor with wave forms?

There are 6 modes of operation of 8253 as follows: MODE 1:PROGRAMMABLE ONE SHOT MODE 0:INTERRUPT ON TERMINAL COUNT MODE 2:RATE GENERATER/PULSE GENERATOR MODE 3:SQUARW WAVE GENERATOR MODE 4:SOFTWARE TRIGGERED STROBE MODE 5:HARDWARE TRIGGERED STROBE There is very long discriptions on each mode wih waveforms.