MPC5643L datasheet(107/136 Pages) FREESCALE

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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

Vmin

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