VS6724 datasheet(24/118 Pages) STMICROELECTRONICS

24 / 118 page

Functional description

VS6724

24/118

2.7.1

Operational mode control

The microprocessor allows high level control of the modes in which the VS6724 can

operate, this avoids the need for the host to be concerned with the complexity of controlling

the timing or power management during mode changes.

Figure 10. State machine at power -up and user mode transitions

The power down mode is entered and exited by driving the hardware CE signal. Transitions

between all other modes are initiated by I²C transactions from the host system or

automatically after time-outs.

Supplies Off

Standby

Power-Down

CE pin LOW

CE pin

Pause Mode

Supplies

turned-off

Supplies

turned-on

& CE pin LOW

Supplies

turned-off

Stop Mode

Run Mode

HIGH

State Machine at power-up

I2C controlled user mode transitions

Uninitialised

Flashgun

Note; Depending on the snapshot

exit transition settings the device will

revert to RUN or PAUSE state

automatically after snapshot

It is possible to enter any of

the user modes direct from the

uninitialised state via an I2C

command

System state changes

Host initiated state

changes

Snapshot

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