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T89C51SND1-ROTIL Datasheet(PDF) 53 Page - ATMEL Corporation |
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T89C51SND1-ROTIL Datasheet(HTML) 53 Page - ATMEL Corporation |
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53 / 60 page ![]() 53 T8xC51SND1 Rev. D – 15-Nov-01 12.31.3 Waveforms Figure 29. FLASH Memory - ISP Waveforms Note: ISP# must be driven through a pull-down resistor (see Section 11.10, page 38). Figure 30. FLASH Memory - Internal Busy Waveforms 12.32 AC Characteristics - External Clock Drive and Logic Level References 12.33.1 Definition of symbols Table 61. External Clock Timing Symbol Definitions 12.34.2 Timings Table 62. External Clock AC Timings VDD= 2.7 to 3.3 V, TA= 0 to 70 °C 12.35.3 Waveforms Figure 31. External Clock Waveform RST T SVRL ISP#1 T RLSX FBUSY bit T BHBL Signals Conditions C Clock H High L Low X No Longer Valid Symbol Parameter Min Max Unit TCLCL Clock Period 50 ns TCHCX High Time 10 ns TCLCX Low Time 10 ns TCLCH Rise Time 3 ns TCHCL Fall Time 3 ns TCR Cyclic Ratio in X2 mode 40 60 % 0.45 V T CLCL VDD - 0.5 VIH1 V IL T CHCX T CLCH T CHCL T CLCX |
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