MC34708 datasheet(41/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

7.5.3.6

Timers

The different timers as used by the state machine are listed by the following. This listing does not include RTC timers for

timekeeping. A synchronization error of up to one clock period may occur with respect to the occurrence of an asynchronous

event, the duration listed below is therefore the effective minimum time period.

7.5.3.6.1

Timing Diagrams

A Turn On event timing diagrams shown in Figure 7.

Figure 7. Power Up Timing Diagram

Table 26. Timer Main Characteristics

Timer

Duration

Clock

Under-voltage Timer

4.0 ms

32 k/32

Reset Timer

40 ms

32 k/32

Watchdog Timer

128 ms

32 k/32

Power Cut Timer

Programmable 0 to 8 seconds

in 31.25 ms steps

32 k/1024

RESETB

WDI

INT

UV Masking

8 ms

20 ms

12 ms

Power Up Sequencer

Turn On Verification

128 ms

2- Cold Start

1- Off

System Core Active

3- Watchdog

4- On

1- Off

3- Watchdog

Power up of the system upon a Turn On Event followed by a transition to the On state if WDI is pulled high

... or transition to Off state if WDI remains low

Turn On Event

Sequencer time slots

WDI Pulled Low

= Indeterminate State

Turn on Event is based on PWRON being pulled low

8 ms

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