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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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83C51KB датащи(PDF) 18 Page - Intel Corporation |
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83C51KB датащи(HTML) 18 Page - Intel Corporation |
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18 / 19 page  18 83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER 6.5 External Data Memory Read Cycle External Data Memory Write Cycle Waveform Figure 6. External Data Memory Write Cycle 6.6 Testing Characteristics Figure 7. Float Waveforms A4256-01 ALE PSEN# TLLAX TLHLL TWHQX PORT 0 P2.0 - P2.7 or A8 - A15 from DPH PORT 2 A8 - A15 from PCH A0-A7 from RI or DPL A0 - A7 from PCL Data Out TWHLH WR# TQVWH TAVWL Instr. In TQVWX TAVLL TLLWL TRLWH VLOAD + 0.1 V VLOAD – 0.1 V Timing Reference Points VLOAD VOH – 0.1 V VOL + 0.1 V For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs and begins to float when a 100 mV change from the loading VOH/VOL level occurs with IOL/IOH = ± 20 mA. A4243-01 |
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