Rainbow-electronics AT89C5132 Manual de usuario descargar pdf (Pagina 153)

153

AT8xC5132

4173A–8051–08/02

Waveforms Figure 131. Flash Memory – ISP Waveforms

Note: ISP must be driven through a pull-down resistor (see Section “In-system Programming”,

page 140).

Figure 132. Flash Memory – Internal Busy Waveforms

External Clock Drive and Logic Level References

Definition of Symbols Table 145. External Clock Timing Symbol Definitions

Timings Table 146. External Clock AC Timings

= 2.7 to 3.3V, T

= 0 to 70°C

Waveforms Figure 133. External Clock Waveform

RST

SVRL

ISP1

RLSX

FBUSY bit

BHBL

Signals Conditions

C Clock H High

L Low

X No Longer Valid

Symbol Parameter Min Max Unit

CLCL

Clock Period 50 ns

CHCX

High Time 10 ns

CLCX

Low Time 10 ns

CLCH

Rise Time 3 ns

CHCL

Fall Time 3 ns

Cyclic Ratio in X2 Mode 40 60 %

0.45 V

CLCL

- 0.5

IH1

CHCX

CLCH

CHCL

CLCX

1 2 ... 148 149 150 151 152 153 154 155 156 157 158 ... 161 162

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Rainbow-electronics AT89C5132 Manual de usuario Pagina 153

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