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7721 Datasheet(PDF) 57 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 57 Page - Renesas Technology Corp |
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57 / 577 page  CONNECTION WITH EXTERNAL DEVICES 3.3 Ready function 7721 Group User’s Manual 3–10 3.3 Ready function Ready function provides the function to facilitate access to external devices that require long access time. ____ The microcomputer enters Ready state by input of “L” level to the RDY pin and retains this state while the ____ level of the RDY pin is at “L.” Table 3.3.1 lists the microcomputer’s state in Ready state. In Ready state, the oscillator’s oscillation does not stop. Accordingly, the internal peripheral devices can operate. Ready function is valid for the internal and external areas. Table 3.3.1 Microcomputer’s state in Ready state Item Oscillation φCPU, φ ___ Pins A0 to A7, A8/D8 to A15/D15, A16/D0 to A23/D7, E, R/W, ____ ____ BHE, BLE, ST0, ST1, ALE Pins P43 to P47, P5 to P10 (Note) Pin φ1 Watchdog timer State Operating Stopped at “L” Retain the state when Ready request was accepted. Outputs clock φ1. Operating Note: This applies when this functions as a programmable I/O port. |
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