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ST72C254G2 数据表(PDF) 17 Page - STMicroelectronics |
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ST72C254G2 数据表(HTML) 17 Page - STMicroelectronics |
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17 / 135 page  ST72104G, ST72215G, ST72216G, ST72254G 17/135 6 SUPPLY, RESET AND CLOCK MANAGEMENT The ST72104G, ST72215G, ST72216G and ST72254G microcontrollers include a range of util- ity features for securing the application in critical situations (for example in case of a power brown- out), and reducing the number of external compo- nents. An overview is shown in Figure 8. See Section 13 ”ELECTRICAL CHARACTERIS- TICS” on page 96 for more details. Main Features s Supply Manager with main supply low voltage detection (LVD) s Reset Sequence Manager (RSM) s Multi-Oscillator (MO) – 4 Crystal/Ceramic resonator oscillators – 1 External RC oscillator – 1 Internal RC oscillator s Clock Security System (CSS) – Clock Filter – Backup Safe Oscillator Figure 8. Clock, Reset and Supply Block Diagram IE D 0 0 0 0 RF RF CRSR CSS WDG fOSC CSS INTER RUPT LVD LOW VOLTAGE DETECTO R (LVD) MULTI- OSCILLATOR (MO) FROM WATCH DOG PERIP HERAL OSC1 RESET VDD VSS RESET SEQUEN CE MANAGER (RSM) CLOCK FILTE R SAFE OSC CLOCK SECUR ITY SYSTE M (CSS) MAIN CLOCK CONTROLLER (MCC) MCO fCPU OSC2 |
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