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HD6432351 데이터시트(PDF) 656 Page - Renesas Technology Corp

부품명 HD6432351
상세설명  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 데이터시트(HTML) 656 Page - Renesas Technology Corp

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Section 14 Smart Card Interface
Rev. 3.00 Sep 15, 2006 page 622 of 988
REJ09B0330-0300
14.3.3
Data Format
Figure 14.3 shows the Smart Card interface data format. In reception in this mode, a parity check
is carried out on each frame, and if an error is detected an error signal is sent back to the
transmitting end, and retransmission of the data is requested. If an error signal is sampled during
transmission, the same data is retransmitted.
Ds
D0
D1
D2
D3
D4
D5
D6
D7
Dp
When there is no parity error
Transmitting station output
Ds
D0
D1
D2
D3
D4
D5
D6
D7
Dp
When a parity error occurs
Transmitting station output
DE
Receiving station
output
: Start bit
: Data bits
: Parity bit
: Error signal
Legend:
Ds
D0 to D7
Dp
DE
Figure 14.3 Smart Card Interface Data Format
The operation sequence is as follows.
[1] When the data line is not in use it is in the high-impedance state, and is fixed high with a pull-
up resistor.
[2] The transmitting station starts transfer of one frame of data. The data frame starts with a start
bit (Ds, low-level), followed by 8 data bits (D0 to D7) and a parity bit (Dp).
[3] With the Smart Card interface, the data line then returns to the high-impedance state. The data
line is pulled high with a pull-up resistor.



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