73S1217F-68MR/F/PE Maxim Integrated, 73S1217F-68MR/F/PE Datasheet - Page 83
![no-image](/images/no-image-200.jpg)
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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There are two, two-byte FIFOs that are used to buffer transmit and receive data. During a T=0 processing, if
a parity error is detected by the 73S1217F during message reception, an error signal (BREAK) will be
generated to the smart card. The byte received will be discarded and the firmware notified of the error.
Break generation and receive byte dropping can be disabled under firmware control. During the
transmission of a byte, if an error signal (BREAK) is detected, the last byte is retransmitted again and the
firmware notified. Retransmission can be disabled by firmware. When a correct byte is received, an
interrupt is generated to the firmware, which then reads the byte from the receive FIFO. Receive overruns
are detected by the hardware and reported via an interrupt. During transmission of a message, the firmware
will write bytes into the transmit FIFO. The hardware will send them to the smart card. When the last byte of
a message has been written, the firmware will need to set the LASTTX bit in the
cause the hardware to insert the CRC/LRC if in a T=1 protocol mode. CRC/LRC generation/checking is only
provided during T=1 processing. Firmware will need to instruct the smart function to go into receive mode
after this last transmit data byte if it expects a response from the smart card. At the end of the smart card
response, the firmware will put the interface back into transmit mode if appropriate.
The hardware can check for the following card-related timeouts:
•
•
•
The firmware will load the Wait Time registers with the appropriate value for the operating mode at the
appropriate time.
an interrupt will be generated and the firmware can take appropriate recovery steps. Support is provided
for adding additional guard times between characters using the
between the last byte received by the 73S1217F and the first byte transmitted by the 73S1217F using the
Block Guard Time register
responsible for all protocol checking and error recovery.
Rev. 1.2
Character Waiting Time (CWT).
Block Waiting Time (BWT).
Initial Waiting Time (IWT).
SCSCLK(5:0)
MCLK =
96MHz
PLL
SCSel(3:2)
SCCLK(5:0)
Figure 21
F/D Register
(BGT). Other than the protocol checks described above, the firmware is
Figure 20: Smart Card CLK and ETU Generation
shows the guard, block, wait and ATR time definitions. If a timeout occurs,
Pre-Scaler
Pre-Scaler
6 bits
6 bits
1/13
1/13
FDReg(7:4)
7.38M
7.38M
FDReg(3:0)
7.38M
MSCLKE
MSCLK
Extra Guard Time register (EGT)
ETU Divider
FI Decoder
12 bits
1/744
Defaults
in Italics
DIV
DIV
by
by
2
2
STXCtl
9926
3.69M
3.69M
ETUCLK
SYNC
SCLK
CLK
SFR. This will
CENTER
EDGE
and
83
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