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MSC1214Y4PAGR Datasheet(PDF) 10 Page - Texas Instruments |
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MSC1214Y4PAGR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 105 page MSC1211, MSC1212 MSC1213,MSC1214 SBAS323D − JUNE 2004 − REVISED SEPTEMBER 2005 www.ti.com 10 EXPLANATION OF THE AC SYMBOLS Each Timing Symbol has five characters. The first character is always ’t’ (= time). The other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. The designators are: A Address C Clock D Input Data H Logic Level High I Instruction (program memory contents) L Logic Level Low, or ALE P PSEN Q Output Data R RD Signal t Time V Valid W WR Signal X No Longer a Valid Logic Level Z Float Examples: (1) tAVLL = Time for address valid to ALE Low. (2) tLLPL = Time for ALE Low to PSEN Low. t LHLL t AVLL t LLPL t PLPH t LLIV t LLAX t PLAZ t PXIZ t PXIX t AVIV t PLIV A0−A7 A0−A7 A8−A15 A8−A15 INSTR IN ALE PSEN PORT 0 PORT 2 Figure 1. External Program Memory Read Cycle t AVLL ALE RD PSEN PORT 0 PORT 2 A0−A7 from RI or DPL DATA IN A0−A7 from PCL INSTR IN P2.0−P2.7 or A8−A15 from DPH A8−A15 from PCH t AVDV t LLDV t WHLH t RLRH t LLWL t LLAX t RLAZ t RHDX t RLDV t AVWL t RHDZ Figure 2. External Data Memory Read Cycle |
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