8080_8224_8228_interrupt_type_interface_for_A_D_converter

Published:2009/7/23 20:56:00 Author:Jessie | From:SeekIC

This circuit shows an interrupt-type interface for the ADC0808/0809 using a 6-bit bus comparator to decode a read-and-write strobe. Viewed from the CPU, this interface looks like a bidirectional data port where the address is set by the logic levels on the in inputs of the DM8131. When data bits are written to the ADC, the 3 least-significant bits on the address bus define the channel to be converted. The rest of the bits are decoded to provide the START and ALE strobes (Fig. 6-13B). When the conversion is completed, EOC sets the interrupt flip-flop, and (when the data bits are read) the interrupt is complete.



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