Decoded_Z80_interface

Published:2009/7/25 5:10:00 Author:Jessie | From:SeekIC

Figure 9-23 shows the ADC0816/17 connected to form a decoded 280 interface. A 6-bit comparator is used to decode A4 through A7 and IOREQ Two NOR gates are used to gate the ALE/START and OE pulses. This configuration functions the same as that of Fig. 9-22, except that the DM8131 provides much more decoding. NATIONAL SEMICONDUCTOR, APPLICATION NOTE 258, 1994, P. 608.



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