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HT83C51 Datasheet(PDF) 7 Page - Honeywell Solid State Electronics Center |
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HT83C51 Datasheet(HTML) 7 Page - Honeywell Solid State Electronics Center |
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7 / 12 page  7 HT83C51 EXTERNAL PROGRAM AND DATA MEMORY CHARATERISTICS Symbol Parameter Min Max Unit TCLCL Clock Period 62.5 ns 1/TCLCL Oscillator Frequency 16 MHz TLHLL ALE Pulse Width 2 TCLCL-40 ns TAVLL Address Valid to ALE Low TCLCL-40 ns TLLAX Address hold after ALE low TCLCL-30 ns TLLIV ALE low to Valid Instruction In 4 TCLCL-100 ns TLLPL ALE Low to PSENn Low TCLCL-30 ns TPLPH PSENn Pulse Width 3 TCLCL-45 ns TPLIV PSENn low to Valid Instruction In 3 TCLCL-105 ns TPXIX Input Instruction hold after PSENn 0 ns TPXIZ Input Instruction Float After PSENn TCLCL-25 ns TAVIV Address to Valid Instruction In 5 TCLCL-105 ns TPLAZ PSENn Low to Address Float 10 ns TRLRH RDn Pulse Width 6 TCLCL-100 ns TWLWH WRn Pulse Width 6 TCLCL-100 ns TRLDV RDn Low to Valid Data In 5 TCLCL-165 ns TRHDX Data Hold After RDn 0 ns TRHDZ Data Float After RDn 2 TCLCL-60 ns TLLDV ALE Low to Valid Data In 8 TCLCL-150 ns TAVDV Address to Valid Data In 9 TCLCL-165 ns TLLWL ALE Low to RDn or WRn Low 3 TCLCL-50 3 TCLCL+50 ns TAVWL Address Valid to WRn Low 4 TCLCL-130 ns TQVWX Data Valid Before WRn TCLCL-50 ns TWHQX Data Hold After WRn TCLCL-50 ns TQVWH Data Valid to WRn High 7 TCLCL-150 ns TRLAZ RDn Low to Address Float 0 ns TWHLH RDn or WRn High to ALE High TCLCL-40 TCLCL+40 ns |
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