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D0 D1 D2 D3 D4 D5 D6 D7 Dp
DE
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
(DE)
Ds D0 D1 D2 D3 D4
Ds
Frame n+1
Retransmitted frame
Frame n
RDRF
[1]
PER
[2]
[3]
[4]
Figure 13.12 Retransmission in SCI Receive Mode
•
Retransmission when SCI is in Transmit Mode
Figure 13.13 illustrates retransmission when the SCI is in transmit mode.
6. If an error signal is sent back from the receiving device after transmission of one frame is
completed, the ERS bit is set to 1 in SSR. If the RIE bit in SCR is set to the enable state, an
ERI interrupt is requested. The ERS bit should be cleared to 0 in SSR before the next parity bit
sampling timing.
7. The TEND bit in SSR is not set for the frame for which the error signal was received.
8. If an error signal is not sent back from the receiving device, the ERS flag is not set in SSR.
9. If an error signal is not sent back from the receiving device, transmission of one frame,
including retransmission, is assumed to have been completed, and the TEND bit is set to 1 in
SSR. If the TIE bit in SCR is set to the enable state, a TXI interrupt is requested.
D0 D1 D2 D3 D4 D5 D6 D7 Dp DE
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
(DE)
Ds D0 D1 D2 D3 D4
Ds
Frame n+1
Retransmitted frame
Frame n
TDRE
TEND
[6]
ERS
Transfer from TDR to TSR
Transfer from TDR to TSR
Transfer from TDR to TSR
[7]
[9]
[8]
Figure 13.13 Retransmission in SCI Transmit Mode
Note on Block Transfer Mode Support: The smart card interface installed in the H8/3008
supports an IC card (smart card) interface with provision for ISO/IEC7816-3 T=0 (character
transmission). Therefore, block transfer operations are not supported (error signal transmission,
detection, and automatic data retransmission are not performed).
Содержание H8/3008
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