73S1215F Maxim, 73S1215F Datasheet - Page 106
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73S1215F
Manufacturer Part Number
73S1215F
Description
The Teridian 73S1215F is a self-contained SoC smart card reader IC that is an ideal solution for any USB-connected ISO 7816 design
Manufacturer
Maxim
Datasheet
1.73S1215F.pdf
(136 pages)
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Block Guard Time Register (BGT): 0xFE16
This register contains the Extra Guard Time Value (EGT) most-significant bit. The Extra Guard Time
indicates the minimum time between the leading edges of the start bit of consecutive characters. The
delay is depends on the T=0/T=1 mode. Used in transmit mode. This register also contains the Block
Guard Time (BGT) value. Block Guard Time is the minimum time between the leading edge of the start
bit of the last character received and the leading edge of the start bit of the first character transmitted.
This should not be set less than the character length. The transmission of the first character will be held
off until BGT has elapsed regardless of the TX data and TX/RX control bit timing.
Extra Guard Time Register (EGT): 0xFE17
This register contains the Extra Guard Time Value (EGT) least-significant byte. The Extra Guard Time
indicates the minimum time between the leading edges of the start bit of consecutive characters. The
delay is depends on the T=0/T=1 mode. Used in transmit mode.
106
BGT.7
BGT.6
BGT.5
BGT.4
BGT.3
BGT.2
BGT.1
BGT.0
EGT.7
EGT.6
EGT.5
EGT.4
EGT.3
EGT.2
EGT.1
EGT.0
Bit
Bit
MSB
MSB
EGT.8
EGT.7
Time in ETUs between start bits of consecutive characters. In T=0 mode, the minimum is
1. In T=0, the leading edge of the next start bit may be delayed if there is a break detected
from the smart card. Default value is 12. In T=0 mode, regardless of the value loaded, the
minimum value is 12, and for T=1 mode, the minimum value is 11.
Symbol
EGT.8
BGT.4
BGT.3
BGT.2
BGT.1
BGT.0
–
–
EGT.6
–
Most-significant bit for 9-bit EGT timer. See EGT below.
Time in ETUs between the start bit of the last received character to start bit
of the first character transmitted to the smart card. Default value is 22.
EGT.5
–
Table 105: The BGT Register
Table 106: The EGT Register
BGT.4
EGT.4
0x0C
0x10
Function
BGT.3
EGT.3
Function
BGT.1
EGT.1
BGT.2
EGT.2
BGT.0
EGT.0
LSB
LSB
Rev. 1.4
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