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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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H8/3028F Datasheet(PDF) 202 Page - Renesas Technology Corp |
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H8/3028F Datasheet(HTML) 202 Page - Renesas Technology Corp |
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202 / 923 page  Rev. 2.00, 09/03, page 172 of 890 When software standby mode is used, the BRLE bit should be cleared to 0 in BRCR before executing the SLEEP instruction. Similar contention in a transition to self-refresh mode may prevent dependable strobe waveform output. This can also be avoided by clearing the BRLW bit to 0 in BRCR. • Immediately after self-refreshing is cleared, external bus release is possible during a given period until the start of a CPU cycle. Attention must be paid to the RAS state to ensure that the specification for the RAS precharge time immediately after self-refreshing is met. φ RFSH Refresh request BACK External bus released Refresh cycle CPU cycle Refresh cycle Figure 6.35 Bus-Released State and Refresh Cycles φ BREQ BACK Software standby mode Address bus Strobe Figure 6.36 Bus-Released State and Software Standby Mode |
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