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AD822 数据表(PDF) 79 Page - Analog Devices |
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AD822 数据表(HTML) 79 Page - Analog Devices |
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79 / 88 page  ADuC841/ADuC842/ADuC843 Rev. 0 | Page 79 of 88 Parameter 16 MHz Core Clk 8 MHz Core Clock EXTERNAL DATA MEMORY READ CYCLE Min Max Min Max Unit tRLRH RD Pulse Width 60 125 ns tAVLL Address Valid after ALE Low 60 120 ns tLLAX Address Hold after ALE Low 145 290 ns tRLDV RD Low to Valid Data In 48 100 Ns tRHDX Data and Address Hold after RD 0 0 ns tRHDZ Data Float after RD 150 625 ns tLLDV ALE Low to Valid Data In 170 350 ns tAVDV Address to Valid Data In 230 470 ns tLLWL ALE Low to RD or WR Low 130 255 ns tAVWL Address Valid to RD or WR Low 190 375 ns tRLAZ RD Low to Address Float 15 35 ns tWHLH RD or WR High to ALE High 60 120 ns ALE (O) PORT 0 (I/O) PORT 2 (O) tWHLH tLLDV tLLWL tRLRH tAVWL tLLAX tAVLL tRLAZ tRHDX tRHDZ tAVDV A0 A7 (OUT) DATA (IN) A16 A23 A8 A15 tRLDV PSEN (O) RD (O) Figure 88. External Data Memory Read Cycle |
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