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MPC5643L 数据表(PDF) 107 Page - Freescale Semiconductor, Inc |
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MPC5643L 数据表(HTML) 107 Page - Freescale Semiconductor, Inc |
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107 / 136 page  Electrical characteristics MPC5643L Microcontroller Data Sheet, Rev. 8.1 Freescale Semiconductor 107 3.19.4 Reset sequence — start condition The impact of the voltage thresholds on the starting point of the internal reset sequence are becoming important if the voltage rails / signals ramp up with a very slow slew rate compared to the overall reset sequence duration. 3.19.4.1 Destructive reset Figure 17 shows the voltage threshold that determines the start of the Destructive Reset Sequence, BIST enabled and the start for the Destructive Reset Sequence, BIST disabled. Figure 17. Reset sequence start for Destructive Resets 3.19.4.2 External reset via RESET Figure 18 shows the voltage thresholds that determine the start of the reset sequences initiated by the assertion of RESET as specified in Table 32. Table 33. Voltage Thresholds Variable name Value Vmin Refer to Table 18 Vmax Refer to Table 18 Supply Rail VDD_HV_PMU TReset, max starts here TReset, min starts here Supply Rail Vmax t V Vmin |
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