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AT90SCR100 Datasheet(PDF) 203 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) 203 Page - ATMEL Corporation

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203
TPR0327AY–SMS–30Jan09
AT90SCR100
Figure 16-2.
DC/DC State Machine
16.5
DC/DC Registers
16.5.1
DCCR - DC/DC Converter Register
• Bit 7 – DCON : DC/DC ON bit
Set (one) this bit to start the DC/DC up. The DC/DC must be started before trying to generate a
Card Vcc using Smart Card Interface.
DCCR.DCRDY bit will inform you when the DCDC is ready to use.
Clear (zero) this bit to shut the DC/DC down.
• Bit 6 – DCRDY : DC/DC Ready bit
This bit is cleared and set by hardware.
After having started the DC/DC using DCCR.DCON, this bit indicates when the DC/DC is ready
to be used.
This bit is cleared when the DC/DC is off.
• Bit 5 – DCBUSY : DC/DC Busy bit
This bit is cleared and set by hardware.
This bit is set when the DC/DC is loaded and running. This means that it is advised to wait for its
reset before changing parameters of DC/DC, shutting DC/DC down etc... See Figure 16-2 on
page 203.
Bit
7
6
5
4
321
0
$0000EF
DCON
DCRDY
DCBUSY
-
-
-
-
-
DCCR
Read/write
R/W
R
R
R
R
R
R
R
Initial value
0
0
0
0
0
0
0
0
0x00
Internal_Supply
DCCR.RDY
DCCR.BUSY
CVcc Signal
DCCR.DCON
= 1
DCCR.DRDY
Modification of
SCICR.VCARD
OK
Shutdown
procedure
SCCON.CARDVCC
= 1
(*): This timing depends on SCICR.VCARD configuration but is, at least, 20μs
SCCON.CARDVCC
= 0
DCCR.DCON
= 0
DCCR.BUSY
~200μs
>20μs
(*)
SCCON.CARDVCC
= 1
>20μs
(*)
SCCON.CARDVCC
= 0
DCCR.BUSY
Modification of
SCICR.VCARD
OK



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