Rainbow Electronics T89C5121 - Manual (Page 37)

37
A/T8xC5121
4164G–SCR–07/06
DC/DC Converter The Smart Card supply voltage (C V
CC
) is generated by the integrated DC/DC converter.
It is controlled by several registers:
• The register described in Section “SCICR Register” controls the CVCC voltage with
bits CVcc0, CVcc1
• The register described in Section “SCCON Register”, switches ON/OFF the DC/DC
converter with bit CARDV
CC
• After the selection of the card voltage (CVcc[1:0]), the CARV
CC
bit is used to switch
on the DC\DC converter. The CVccOK bit indicates that the card voltage is within
the voltage range.
• It is mandatory to switch off the CV
CC
before entering in power-down mode.