Maxim Integrated 73S12xxF - Manual (Page 31)

UG_12xxF_018 Using Synchronous Smart Cards with the 73S12xxF
Rev. 1.0 31
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A
Turn on VCC and configure
VCC stability checking for
READY START or VCC timer
by setting or clearing the
RDYST and VCCSEL[0:1] bits
in VccCtl, set SCIE for
VTMREN (if used)
Wait for smart card Interrupt
There are two methods to determine when
VCC is stable. READY START uses the
hardware to determine when VCC is stable.
The VCC timer is used to wait for a time and
then continue with activation if RDY is set
when the timer expires.
Wait for VCC to stabilize.
VCCOK bit set
in VccCtl?
VCC stable
VCC not
stable
Read SCInt
VCC stable is RDY =1 with or without VCCTimer
expiration (depending on method selected).
Figure 30: I
2
C Card Activation Flowchart