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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7041A датащи(PDF) 211 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 211 Page - Renesas Technology Corp |
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211 / 923 page  173 • Bits 15–8—Idles between Cycles (IW31, IW30, IW21, IW20, IW11, IW10, IW01, IW00): These bits specify idle cycles inserted between consecutive accesses when the second one is to a different CS area after a read. Idles are used to prevent data conflict between ROM (and other memories, which are slow to turn the read data buffer off), fast memories, and I/O interfaces. Even when access is to the same area, idle cycles must be inserted when a read access is followed immediately by a write access. The idle cycles to be inserted comply with the area specification of the previous access . Refer to section 10.6, Waits between Access Cycles, for details. IW31, IW30 specify the idle between cycles for CS3 space; IW21, IW20 specify the idle between cycles for CS2 space; IW11, IW10 specify the idle between cycles for CS1 space and IW01, IW00 specify the idle between cycles for CS0 space. Bit 15 (IW31) Bit 14 (IW30) Description 0 0 No idle cycle after accessing CS3 space 1 Inserts one idle cycle after accessing CS3 space 1 0 Inserts two idle cycles after accessing CS3 space 1 Inserts three idle cycles after accessing CS3 space (initial value) Bit 13 (IW21) Bit 12 (IW20) Description 0 0 No idle cycle after accessing CS2 space 1 Inserts one idle cycle 1 0 Inserts two idle cycles 1 Inserts three idle cycles (initial value) Bit 11 (IW11) Bit 10 (IW10) Description 0 0 No idle cycle after accessing CS1 space 1 Inserts one idle cycle 1 0 Inserts two idle cycles 1 Inserts three idle cycles (initial value) |
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