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ST62T62CB3 Datasheet(PDF) 18 Page - STMicroelectronics |
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ST62T62CB3 Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 78 page  18/78 ST62T52C ST62T62C/E62C 3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES 3.1 CLOCK SYSTEM The MCU features a Main Oscillator which can be driven by an external clock, or used in conjunction with an AT-cut parallel resonant crystal or a suita- ble ceramic resonator, or with an external resistor (RNET). In addition, a Low Frequency Auxiliary Os- cillator (LFAO) can be switched in for security rea- sons, to reduce power consumption, or to offer the benefits of a back-up clock system. The Oscillator Safeguard (OSG) option filters spikes from the oscillator lines, provides access to the LFAO to provide a backup oscillator in the event of main oscillator failure and also automati- cally limits the internal clock frequency (fINT) as a function of VDD, in order to guarantee correct oper- ation. These functions are illustrated in Figure 9., Figure 10., Figure 11. and Figure 12.. Figure 8. illustrates various possible oscillator con- figurations using an external crystal or ceramic res- onator, an external clock input, an external resistor (RNET), or the lowest cost solution using only the LFAO. CL1 an CL2 should have a capacitance in the range 12 tST6_CLK1o 22 pF for an oscillator fre- quency in the 4-8 MHz range. The internal MCU clock frequency (fINT) is divided by 12 to drive the Timer, the A/D converter and the Watchdog timer, and by 13 to drive the CPU core, as may be seen in Figure 11.. With an 8 MHz oscillator frequency, the fastest ma- chine cycle is therefore 1.625µs. A machine cycle is the smallest unit of time needed to execute any operation (for instance, to increment the Program Counter). An instruction may require two, four, or five machine cycles for execution. 3.1.1 Main Oscillator The oscillator configuration may be specified by se- lecting the appropriate option. When the CRYS- TAL/RESONATOR option is selected, it must be used with a quartz crystal, a ceramic resonator or an external signal provided on the OSCin pin. When the RC NETWORK option is selected, the system clock is generated by an external resistor. The main oscillator can be turned off (when the OSG ENABLED option is selected) by setting the OSCOFF bit of the ADC Control Register. The Low Frequency Auxiliary Oscillator is automatical- ly started. Figure 8. Oscillator Configurations INTEGRATED CLOCK CRYSTAL/RESONATOR option OSG ENABLED option OSCin OSCout CL1n CL2 ST6xxx CRYSTAL/RESONATOR CLOCK CRYSTAL/RESONATOR option OSCin OSCout ST6xxx EXTERNAL CLOCK CRYSTAL/RESONATOR option NC OSCin OSCout ST6xxx NC OSCin OSCout RNET ST6xxx RC NETWORK RC NETWORK option NC |
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