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AT90SCR100 Datasheet(PDF) 202 Page - ATMEL Corporation

Part # AT90SCR100
Description  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 Datasheet(HTML) 202 Page - ATMEL Corporation

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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?
No
Yes
Poll to know when CVcc has
reached the desired voltage
SCISR.VCARDOK=1
?
No
Yes
Caution
!



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