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ST62E25BD1 Datasheet(PDF) 20 Page - STMicroelectronics |
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ST62E25BD1 Datasheet(HTML) 20 Page - STMicroelectronics |
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20 / 105 page  ST6215C ST6225C 20/105 CLOCK SYSTEM (Cont’d) 5.1.1 Main Oscillator The oscillator configuration is specified by select- ing the appropriate option in the option bytes (refer to the Option Bytes section of this document). When the CRYSTAL/RESONATOR option is se- lected, it must be used with a quartz crystal, a ce- ramic resonator or an external signal provided on the OSCin pin. When the RC NETWORK option is selected, the system clock is generated by an ex- ternal resistor (the capacitor is implemented inter- nally). The main oscillator can be turned off (when the OSG ENABLED option is selected) by setting the OSCOFF bit of the ADC Control Register (not available on some devices). This will automatically start the Low Frequency Auxiliary Oscillator (LFAO). The main oscillator can be turned off by resetting the OSCOFF bit of the A/D Converter Control Reg- ister or by resetting the MCU. When the main os- cillator starts there is a delay made up of the oscil- lator start-up delay period plus the duration of the software instruction at a clock frequency fLFAO. Caution: It should be noted that when the RC net- work option is selected, the accuracy of the fre- quency is about 20% so it may not be suitable for some applications (For more details, please refer to the Electrical Characteristics Section). Table 5. Oscillator Configurations Notes: 1. To select the options shown in column 1 of the above table, refer to the Option Byte section. 2.This schematic are given for guidance only and are sub- ject to the schematics given by the crystal or ceramic res- onator manufacturer. 3. For more details, please refer to the Electrical Charac- teristics Section. Hardware Configuration OSCin OSCout EXTERNAL ST6 CLOCK NC External Clock OSCin OSCout LOAD CAPACITORS 3) ST6 CL2 CL1 Crystal/Resonator Clock 2) OSCin OSCout ST6 RNET NC RC Network OSCin OSCout ST6 LFAO NC 1 |
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