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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST52T301 датащи(PDF) 27 Page - STMicroelectronics |
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ST52T301 датащи(HTML) 27 Page - STMicroelectronics |
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27 / 100 page  5 CLOCK ST52x301 can work by using a 5, 10 or 20 MHz clock. The ST52x301 Clock Generator module generates the internal clock for the internal Control Unit, ALU, Fuzzy Core and on-chip peripherals and it is designed to require a minimum of exte rnal components. The system clock may be generatedby using either a qua r tz cr ystal , or a cera mic res onat or (CERALOC); or, at least, by means of an external clock. The different clock generator options connection methods are shown in Figure 5.1. When an external clock is used, it must be connectedon the pin OSCin while OSCout must be grounded. The crystal oscillator start-up time is a function of manyvariables:crystal parameters(especially RS), oscillator load capacitance (CL), IC parameters, ambient temperature, supply voltage. It must be observed that the crystal or ceramic leads and circuit connections must be as short as possible. Typical values for CL1, CL2 are 10pF for a 20 MHz crystal. Figure 5.1. Oscillator Connections 27/99 ST52T301/E301 |
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