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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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6V7 датащи(PDF) 32 Page - Renesas Technology Corp |
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6V7 датащи(HTML) 32 Page - Renesas Technology Corp |
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32 / 298 page  Rev.1.00 May 18, 2004 page 32 of 296 M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP ________ (5) RDY signal ________ RDY signal facilitates access of external devices that require a long time for access. As shown in ________ Figure 2.4.6, if an “L” is being input to the RDY pin at the BCLK falling edge, the bus turns to the wait ________ state. If an “H” is being input to the RDY pin at the BCLK falling edge, the bus cancels the wait state. Table 2.4.6 shows the microcomputer state in the wait state. Figure 2.4.5 shows the example of the _____ ________ RD signal being extended using the RDY signal. ________ The RDY signal is valid when accessing the external area during the bus cycle in which bits 4 to 7 of ________ the chip select control register (address 000816) are set to “0.” The RDY signal is invalid when setting ________ “1” to all bits 4 to 7 of the chip select control register (address 000816), but the RDY pin should be treated as properly as in non-using. Table 2.4.6 Microcomputer status in ready state (Note) Item Status Oscillation On ___ _____ R/W signal, address bus, data bus, CS ________ Maintain status when RDY signal received __________ ALE signal, HLDA, programmable I/O ports Internal peripheral circuits On ________ Note: The RDY signal cannot be received immediately prior to a software wait. _____ ________ Figure 2.4.5 Example of RD signal extended by RDY signal BCLK RD CSi (i=0 to 3) RDY tsu(RDY - BCLK) In an instance of separate bus : Wait using RDY signal : Wait using software Accept timing of RDY signal |
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