D12320VF25V Datasheet, PDF (555/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 13 Smart Card Interface
Serial Data Reception (Except Block Transfer Mode): Data reception in smart card mode uses
the same processing procedure as for the normal SCI. Figure 13.7 shows an example of the
transmission processing flow.
[1] Perform smart card interface mode initialization as described above in Initialization.
[2] Check that the ORER flag and PER flag in SSR are cleared to 0. If either is set, perform the
appropriate receive error handling, then clear both the ORER and the PER flag to 0.
[3] Repeat steps [2] and [3] until it can be confirmed that the RDRF flag is set to 1.
[4] Read the receive data from RDR.
[5] When receiving data continuously, clear the RDRF flag to 0 and go back to step [2].
[6] To end reception, clear the RE bit to 0.
Start
Initialization
Start of reception
ORER = 0 and
No
PER = 0?
Yes
No
RDRF = 1?
Yes
Read RDR and clear
RDRF flag in SSR to 0
Error handling
No
All data received?
Yes
Clear RE bit to 0
Figure 13.7 Sample Reception Flowchart
Rev.7.00 Feb. 14, 2007 page 521 of 1108
REJ09B0089-0700