MPC5673K datasheet(109/140 Pages) FREESCALE

109 / 140 page

Electrical characteristics

MPC5675K Microcontroller Data Sheet, Rev. 4

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

109

3.21.4.3

External Reset via RESET

Figure 29 shows the voltage thresholds that determine the start of the reset sequences initiated by the

assertion of RESET as specified in Table 59.

Figure 29. Reset sequence start via RESET assertion

3.21.5

External watchdog window

If the application design requires the use of an external watchdog the data provided in Section 3.21, Reset

sequence, can be used to determine the correct positioning of the trigger window for the external

watchdog. Figure 30 shows the relationships between the minimum and the maximum duration of a given

reset sequence and the position of an external watchdog trigger window.

Figure 30. Reset sequence—external watchdog trigger window position

0.65 × VDD_HV_IO

RESET_SUP

TReset, min starts here

TReset, max starts here

0.352 × VDD_HV_IO

Internal Reset Sequence

Start condition (signal or voltage rail)

Earliest

Application

Start

Latest

Application

Start

Application time required

to prepare watchdog trigger

TWDStart, min

TWDStart, max

TReset, min

TReset, max

Watchdog needs to be triggered within this window

External Watchdog window open

External Watchdog window closed

Basic Application Init

Application Running

Watchdog Trigger

External Watchdog window closed

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