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ATmega128 データシート(PDF) 30 Page - ATMEL Corporation |
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ATmega128 データシート(HTML) 30 Page - ATMEL Corporation |
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30 / 386 page  30 2467S–AVR–07/09 ATmega128 Figure 14. External Data Memory Cycles with SRWn1 = 0 and SRWn0 = 1 (1) Note: 1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or SRW00 (lower sector). The ALE pulse in period T5 is only present if the next instruction accesses the RAM (internal or external). Figure 15. External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 0 (1) Note: 1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or SRW00 (lower sector). The ALE pulse in period T6 is only present if the next instruction accesses the RAM (internal or external). ALE T1 T2 T3 WR T5 A15:8 Address Prev. addr. DA7:0 Address Data Prev. data XX RD DA7:0 (XMBK = 0) Data Prev. data Address Data Prev. data Address DA7:0 (XMBK = 1) System Clock (CLKCPU) T4 ALE T1 T2 T3 WR T6 A15:8 Address Prev. addr. DA7:0 Address Data Prev. data XX RD DA7:0 (XMBK = 0) Data Prev. data Address Data Prev. data Address DA7:0 (XMBK = 1) System Clock (CLKCPU) T4 T5 |
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