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A programmable bus system has been developed to solve several problems in the design and implementation of microprocessor-based systems. This bus system consists of two parts; a standard I/O bus add-on card, and the bus system motherboard. The proposed bus provides four slots, each slot has independent interrupts, decoding signals, and a programmab...
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... oscillator chip (PXO-600) generates 57 different frequencies from a quartz crystal (600kHz), which represents the base clock. Also, it is possible to supply an external clock with additional 57 frequencies, as shown in Fig.4. The first stage frequency divider provides dividing ratios of 1/1 to 1/12 as selected by the programming pins p1, p2, and p3. ...
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