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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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H8SX1663 датащи(PDF) 222 Page - Renesas Technology Corp |
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H8SX1663 датащи(HTML) 222 Page - Renesas Technology Corp |
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222 / 1158 page  Section 6 Bus Controller (BSC) Rev.1.00 Jun. 07, 2006 Page 170 of 1102 REJ09B0294-0100 For example, in an external address space access where the frequency rate of I φ and Bφ is n : 1, the operation is performed in synchronization with B φ. In this case, external 2-state access space is 2n cycles and external 3-state access space is 3n cycles (no wait cycles is inserted) if the number of access cycles is counted based on I φ. If the frequencies of I φ, Pφ and Bφ are different, the start of bus cycle may not synchronize with P φ or Bφ according to the bus cycle initiation timing. In this case, clock synchronization cycle (Tsy) is inserted at the beginning of each bus cycle. For example, if an external address space access occurs when the frequency rate of I φ and Bφ is n : 1, 0 to n-1 cycles of Tsy may be inserted. If an internal peripheral module access occurs when the frequency rate of I φ and Pφ is m : 1, 0 to m-1 cycles of Tsy may be inserted. Figure 6.6 shows the external 2-state access timing when the frequency rate of I φ and Bφ is 4 : 1. Figure 6.7 shows the external 3-state access timing when the frequency rate of I φ and Bφ is 2 : 1. |
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