73s1210f68im Maxim Integrated Products, Inc., 73s1210f68im Datasheet - Page 77
73s1210f68im
Manufacturer Part Number
73s1210f68im
Description
Self-contained Smart Card Reader With Pinpad And Power Management
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.73S1210F68IM.pdf
(126 pages)
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DS_1210F_001
Rev. 1.4
t1: The time from setting VCCSEL bits until VCCOK = 1.
tto: The time from setting VCCSEL bits until VCCTMR times out. At t1 (if RDYST = 1) or tto (if RDYST = 0),
activation starts. It is suggested to have RDYST = 0 and use the VCCTMR interrupt to let MPU know when
sequence is starting.
t2: time from start of activation (no external indication) until IO goes into reception mode (= 1). This is approximately
4 SCCLK (or SCECLK) clock cycles.
t3: minimum one half of ETU period.
t4: ETU period.
Note that in Sync mode, IO as input is sampled on the rising edge of CLK. IO changes on the falling edge of CLK,
either from the card or from the 73S1210F. The RST signal to the card is directly controlled by the RSTCRD bit
(non-inverted) via the MPU and is shown as an example of a possible RST pattern.
1. Clear CLKOFF after Card is in reception mode.
2. Set RST bit.
3. Interrupt is generated when Rlength counter is MAX.
4. Read and clear Interrupt.
5. Clear RST bit.
6. Toggle TX/RXB to reset bit counter.
7. Reload RLength Counter.
TX/RXB Mode bit
Rlength Interrupt
RSTCRD
IO reception on
RLength Count
VCCOK
RLenght = 1
VCCSEL
(TX = '1')
VCC
RST
CLK
bits
CLKOFF
IO
CLKLVL
Figure 21: Example of Sync Mode Operation: Generating/Reading ATR Signals
RST
CLK
t1
tto
t1
1
2
Figure 20: Synchronous Activation
t2
Count MAX
t3
3
6
4
5
t1. CLK wll start at least 1/2 ETU after CLKOFF is set low
when CLKLVL = 0
7
t4
73S1210F Data Sheet
77
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