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7721 Datasheet(PDF) 417 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 417 Page - Renesas Technology Corp |
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417 / 577 page  APPLICATION 7721 Group User’s Manual 16–14 16.1 Memory connection Fig. 16.1.10 Example of using Ready function (software Wait) M37721 1D 1CK 1Q AC74 AC32 AC32 AC04 2D 2CK 2Q CLR AC04 1 1 E CS2 2Q RDY tsu(RDY- 1) AC04 + AC74 + AC32’s propagation delay time th( 1-RDY) 1Q A B A8–A23 (D0–D15) A0–A7 RDY E 1 Address decode circuit Address latch circuit Data bus CS1 CS2 Address bus Validate Ready function only for areas accessed by CS2. V1 to V3 : Make sure that the sum of propagation delay time is within 25 ns. Circuit conditions : f(XIN) ≤ 25 MHz, software Wait V3 V2 V1 Ready request is accepted at A . Termination request for Ready state is accepted at B . A , B : Judgement timing of RDY pin’s input level : E (“L” level) stopped by Ready function : E (“L” level) stopped by software Wait |
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