MS51
Nov. 28, 2019 Page 393 of 491 Rev 1.00
MS51 32K SERIES TECHNICAL REFERENCE MANUAL
In transmit direction, the ISO 7816 sends data to ISO 7816-3 host controller, first. After the period is
greater than (16.5 or 22.5, by T bit setting), the ISO 7816-3 host controller begin to send the data.
Block Guard Time
Last Receiver Data Transmitter Data
Figure 6.10-5 Transmit Direction Block Guard Time Operation
In receive direction, the ISO 7816-3 host controller sends data to ISO 7816-3, first. If the ISO 7816-3
sends data to ISO 7816-3 host controller at the time which is less than (16.5 or 22.5, by T bit
setting),the block guard time interrupt BGTIF (ScnIS[3]) is generated when RXBGTEN (SCnCR1[5])
and BGTIEN (ScnIE[3]) are enabled.
Block Guard Time
Last Transmitter Data Receiver Data
Figure 6.10-6 Receive Direction Block Guard Time Operation
Extra Guard Time is EGT (SCnEGT[7:0]),it only affects the data transmitted by ISO 7816-3 interface,
the format is shown as Figure 6.10-7.
Start
Start
D1 D2 D3 D4 D5 D6 D7 D8 P
EGTStop bit
Figure 6.10-7 Extra Guard Time Operation
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