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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ATmega162V-8AI 数据表(PDF) 29 Page - ATMEL Corporation |
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ATmega162V-8AI 数据表(HTML) 29 Page - ATMEL Corporation |
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29 / 324 page  29 2513K–AVR–07/09 ATmega162/V 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 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 Address Data Prev. data Address DA7:0 (XMBK = 1) System Clock (CLKCPU) T4 T5 |
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