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701 / 940 page  CONNECTING EXTERNAL DEVICES 7735 Group User’s Manual 12–25 12.4 Hold function External address bus Because the bus is not in use, the address which was output immediately before is output again, instead of a new address. HLDA HOLD BHE ALE g External address bus/ External data bus Sampling timing Note: The same operation is performed independent of the software wait (no wait, wait 0, or wait 1). This diagram shows the operation when no wait is selected. CS0 to CS4 Clock 1 External data bus Data length External data bus width Software wait 16 8, 16 No wait, Not in use q State when “L” level is input to pin HOLD Wait 1, Wait 0 8, 16 8 <<When “L” level is input to pin HOLD while bus is not in use>> Address B 1 ! 1 1 ! 1 Bus is in use. Bus is not in use. Address A Data Address A Floating Floating Bus is in use. Hold state g RDE, WEL, WEH Fig. 12.4.2 Timing when hold state is accepted and terminated (1) |
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