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H8SX/1663R データシート(PDF) 385 Page - Renesas Technology Corp |
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H8SX/1663R データシート(HTML) 385 Page - Renesas Technology Corp |
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385 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 353 of 1468 REJ09B0412-0200 (5) External NOP Cycles and Idle Cycles A cycle in which an external space is not accessed due to internal operations is called an external NOP cycle. Even when an external NOP cycle occurs between consecutive external bus cycles, an idle cycle can be inserted. In this case, the number of external NOP cycles is included in the number of idle cycles to be inserted. Figure 9.97 shows an example of external NOP and idle cycle insertion. T 1 T 2 T 3 T pw T 1 T 2 T 3 T pw T i T i Address bus No external access (NOP) Specified number of idle cycles or more including no external access cycles (NOP) Idle cycle (remaining) Following bus cycle Preceding bus cycle (Condition: Number of idle cycles to be inserted when different reads continue: 4 cycles) Data bus B φ CS (area B) CS (area A) RD Figure 9.97 Idle Cycle Insertion Example |
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