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MSC1212Y5PAGT Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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MSC1212Y5PAGT Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 69 page MSC1212 8 SBAS278A www.ti.com 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 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 A. External Program Memory Read Cycle. FIGURE B. External Data Memory Read Cycle. |
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