AT90SCR100 datasheet(202/433 Pages) ATMEL

202 / 433 page

202

TPR0327AY–SMS–30Jan09

AT90SCR100

Figure 16-1.

DC/DC initialization procedure:

16.3.2

Changing VCard Level Parameter

It is forbidden to modify the voltage delivered by CVcc while DC/DC is loaded.

The DCCR.DCBUSY bit permits to check the state of DC/DC load. While it is set, it is advised to

not:

• Shut the DC/DC Off (using DCCR.DCON bit)

• Change SCICR.VCARD[0..1] parameter

16.4

Summary: State Machine

The graph below permits to see how work the different signals of the DC/DC, and understand

what is accepted, or not, regarding the moment of DC/DC use:

This procedure does not take into account any error signal. This should be added

for full Smart Card Interface management.

DC/DC Activation

CVcc generated

Need activation

sequence

Wait for Card Insertion

DCCR.DCON=1

Set SCICR.VCARD

SCCON.CARDVCC=1

Start the DC/DC Converter

No Card Presence required

Configure the Voltage to generate

No Card Presence required

Ask for CVcc generation

As the DCDC voltage is now generated,

the activation sequence can be processed

This can be done either by polling

or interruption.

See Card Presence Input section

Poll DC/DC Converter is ready

DCCR.DCRDY=1?

Yes

Poll to know when CVcc has

reached the desired voltage

SCISR.VCARDOK=1

Yes

Caution

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