Microprocessor

(b) The port addresses of an 8253 ir. an 8085 run system are as follows: Counter 0:A h, Counter 1: Alh, Counter 2: 42h,CWR : A3h. Explain what the following two programs achieve in terms of &253 programming and also draw their corresponding waveforms across CJ.K. GATE and OUT pins for the given counts. Counters are negatively erigt. triggered with GATE signal always kept high during counting. (4) \begin{tabular}{ll} Program 1 & Program 2 \\ MVI A, 54H & MVI A, 98H \\ OUT A.3H & OUT A3H \\ MVI A, 03H & iVV: 4.13H \\ OUT AlH & OUT A2H \\ HLT & HLT \end{tabular}