73S1217F-68MR/F/PE Maxim Integrated, 73S1217F-68MR/F/PE Datasheet - Page 81
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73S1217F-68MR/F/PE
Manufacturer Part Number
73S1217F-68MR/F/PE
Description
8-bit Microcontrollers - MCU
Manufacturer
Maxim Integrated
Datasheet
1.73S1217F-68MRFPE.pdf
(140 pages)
Specifications of 73S1217F-68MR/F/PE
Rohs
yes
Core
80515
Data Bus Width
8 bit
Part # Aliases
90-W1217+TF5
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1.7.17.2
A card insertion event generates an interrupt to the firmware, which is then responsible for the
configuration of the electrical interface, the UART and activation of the card. The activation sequencer
goes through the power up sequence as defined in the ISO 7816-3 specification. An asynchronous
activation timing diagram is shown in Figure 18. After the card RST is de-asserted, the firmware instructs
the hardware to look for a TS byte that begins the ATR response. If a response is not provided within the
pre-programmed timeout period, an interrupt is generated and the firmware can then take appropriate
action, including instructing the 73S1217F to begin a deactivation sequence. Once commanded, the
deactivation sequencer goes through the power down sequence as defined in the ISO 7816-3
specification. If an ATR response is received, the hardware looks for a TS byte that determines
direct/inverse convention. The hardware handles the indirect convention conversion such that the
embedded firmware only receives direct convention. This feature can be disabled by firmware within the
SByteCtl
firmware. If during the card session, a card removal, over-current or other error event is detected, the
hardware will automatically perform the deactivation sequence and then generate an interrupt to the
firmware. The firmware can then perform any other error handling required for proper system operation.
Smart card RST, I/O and CLK, C4, C8 shall be low before the end of the deactivation sequence. Figure
19 shows the timing for a deactivation sequence.
Rev. 1.2
t1: SELSC.1 bit set (selects internal ICC interface) and a non-zero value in VCCSEL bits (calling for
a value of Vcc of 1.8, 3.0, or 5.0 volts) will begin the activation sequence. t1 is the time for Vcc to rise
to acceptable level, declared as Vcc OK (bit VCCOK gets set). This time depends on filter capacitor
value and card Icc load.
tto: The time allowed for Vcc to rise to Vcc OK status after setting of the VCCSEL bits. This time is
generated by the VCCTMR counter. If Vcc OK is not set, (bit VCCOK) at this time, a deactivation will
be initiated. VCCSEL bits are not automatically cleared. The firmware must clear the VCCSEL bits
before starting a new activation.
t2: Time from VCCTmr timeout and VCC OK to IO reception (high), typically 2-3 CLK cycles if
RDYST = 0. If RDYST = 1, t2 starts when VCCOK = 1.
t3: Time from IO = high to CLK start, typically 2-3 CLK cycles.
t4: Time allowed for start of CLK to de-assertion of RST. Programmable by the
t5: Time allowed for ATR timeout, set by the
Note: If the RSTCRD bit is set, RST is asserted (low). Upon clearing RSTCRD bit, RST will be
de-asserted after t4.
RSTCRD bit
VCCOK bit
register. Parity checking and break generation is performed on the TS byte unless disabled by
Answer to Reset Processing
VCCSEL
SELSC
VCC
RST
CLK
bits
bits
IO
Figure 18: Asynchronous Activation Sequence Timing
t1
tto
t2
t3
STSTO
t4
register.
t5
t4
RLength
See Note
ATR starts
register.
81
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