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ST52T400 Datasheet(PDF) 42 Page - STMicroelectronics |
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ST52T400 Datasheet(HTML) 42 Page - STMicroelectronics |
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42 / 94 page  ST52T400/T440/E440/T441 42/94 5 CLOCK, RESET & POWER SAVING MODE 5.1 Clock System The ST52x400/440/441 Clock Generator module generates the internal clock for the internal Con- trol Unit, ALU and on-chip peripherals and is designed to require a minimum of external compo- nents. The ST52x400/440/441 oscillator circuit gener- ates an internal clock signal with the same period and phase as at the OSCin input pin. The maxi- mum frequency allowed is 20 MHz. The system clock may be generated by using either a quartz crystal, ceramic resonator (CER- ALOC), or an external clock. The different clock generator options connection methods are illustrated in Oscillator Connec- tions.When an external clock is used, it must be connected to the pin OSCin while OSCout should be left floating. The crystal oscillator start-up time is a function of many variables: crystal parameters (especially Rs), oscillator load capacitance (CL), IC parame- ters, environment temperature, supply voltage. It must be observed that the crystal or ceramic lead and circuit connections must be as short as possible. Typical values for CL1, CL2 are 10pF for a20MHz crystal. Figure 5.1 Oscillator Connections OSCin OSCout ST52X440 OSCin ST52X440 OSCout CRYSTAL CLOCK EXTERNAL CLOCK Cl1 10pF Cl2 10pF CLOCK INPUT |
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