In some microcomputers, the MPU can be disabled for short periods of time while another device controls
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In some microcomputers, the MPU can be disabled for short periods of time while another device controls the RAM, ROM, and I/O. During these intervals, a special control signal (D̅M̅A̅) is activated by the MPU and is used to disable (deactivate) the device select logic so that the
are all in their inactive state. Modify the circuit of Figure 4-82 so that
will be deactivated whenever the signal D̅M̅A̅ is active, regardless of the state of the address code.
Figure 4-82
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Related Book For
Digital Systems Principles And Application
ISBN: 9780134220130
12th Edition
Authors: Ronald Tocci, Neal Widmer, Gregory Moss
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