AN3316 datasheet(32/42 Pages) STMICROELECTRONICS

32 / 42 page

Device modes

AN3316

32/42

Doc ID 18232 Rev 2

Figure 18.

Power domain

It is possible to check for transition completion through mode Transition Status bit:

while (ME.GS.MTRANS != 0)

//transition ongoing

...

//transition completed

...

No timer is used here to check for the transition completion as timers are switched-off

during RUN0

 STANDBY transition

STANDBY mode:

At the end of the transition, device enters in STANDBY and stay there until the API not

generates a wakeup event. At this time the STANDBY exiting starts

Transition STANDBY

 RESET  DRUN mode:

Once the wakeup event is generated, the device re-executes the Power-On Reset

phase staying in RESET mode. At the end, device enters in DRUN mode, where the

DRUN configuration register resets except for the DRUN.CFLAON/DFLAON that

maintains the values configured before STANDBY entering. This allows to put

CFLASH/DFLASH in Power Down once in DRUN.

PCON

F1[new mode]

new mode

wakeup

PCON

F2[new mode]

new mode

wakeup

PCU

Determine new

power state

Determine new

power state

power down

power up

power down

power up

FSN

Supply

Ground

Power domain #12

Core

Flash

Peripheral

set #1

PLL0

JTAG

...

Power Domain #2

SRAM(24KB)

VREG

SRAM (8K), Power Control Unit(PCU), RESET

Generation Module(RGM), Voltage regulator.

Wakeup Unit, API, CAN sampler, 16MHz & 128

KHz RC oscillator, RC digital interface & voltage

Power Domain #0

Note:

represents a power switching device. For the sake of simplicity this has been drawn as a mechanical switch.

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