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H8/3003 Datasheet(PDF) 167 Page - Renesas Technology Corp |
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H8/3003 Datasheet(HTML) 167 Page - Renesas Technology Corp |
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167 / 715 page  Figure 7-5 DRAM Control Signal Output Timing (2) (2 CAS Mode) Refresh Cycle Priority Order: When there are simultaneous bus requests, the priority order is: (High) External bus master > refresh controller > DMA controller > CPU (Low) For details see section 6.3.7, Bus Arbiter Operation. Wait State Insertion: When bit AST3 is set to 1 in ASTCR, bus controller settings can cause wait states to be inserted into bus cycles and refresh cycles. For details see section 6.3.5, Wait Modes. ø ( ) CS RAS 3 ( ) HWR UCAS ( ) LWR LCAS ( ) RD WE RFSH AS Read cycle Write cycle Refresh cycle * Row Column Row Column Area 3 top address Note: 16-bit access * Address bus 149 |
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