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ST72141K 数据表(PDF) 21 Page - STMicroelectronics |
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ST72141K 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 132 page  ST72141K 21/132 RESET MANAGER (Cont’d) Internal Low Voltage Detection RESET (option) Two different RESET sequences caused by the in- ternal LVD circuitry can be distinguished: - LVD Power-On RESET - Voltage Drop RESET In the second sequence, a “delay” phase is used to keep the device in RESET state until VDD rises up to VLVDr (see Figure 13). Figure 13. LVD RESET Sequences RESET RUN INTERNAL RESET 4096 CLOCK CYCLES FETCH VECTOR POWER- RESET PIN EXTERNAL RESET SOURCE WATCHDOG RESET RESET RUN INTERNAL RESET 4096 CLOCK CYCLES FETCH VECTOR RUN RESET PIN EXTERNAL RESET SOURCE VDD VDDnominal WATCHDOG RESET DELAY VLVDr VLVDf VDD VDDnominal VLVDr OFF |
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