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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST6255CB6/XXX Scheda tecnica(PDF) 21 Page - STMicroelectronics |
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ST6255CB6/XXX Scheda tecnica(HTML) 21 Page - STMicroelectronics |
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21 / 86 page  21/86 ST62T55C ST62T65C/E65C CLOCK SYSTEM (Cont’d) Oscillator Control Registers Address: DCh — Write only Reset State: 00h Bit 7-4. These bits are not used. Bit 3. Reserved. Cleared at Reset. Must be kept cleared. Bit 2. Reserved. Must be kept low. RS1-RS0. These bits select the division ratio of the Oscillator Divider in order to generate the inter- nal frequency. The following selctions are availa- ble: Note: Care is required when handling the OSCR register as some bits are write only. For this rea- son, it is not allowed to change the OSCR contents while executing interrupt service routine, as the service routine cannot save and then restore its previous content. If it is impossible to avoid the writing of this register in interrupt service routine, an image of this register must be saved in a RAM location, and each time the program writes to OSCR it must write also to the image register. The image register must be written first, so if an inter- rupt occurs between the two instructions the OSCR is not affected. 70 --- - OSCR 3 -RS1 RS0 RS1 RS0 Division Ratio 0 0 1 1 0 1 0 1 1 2 4 4 |
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