HD6413008VF25 Datasheet, PDF (447/688 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

13. Smart Card Interface
1. Data write
TDR
Data 1
TSR
(shift register)
2. Transfer from TDR to TSR
3. Serial data output
Data 1
Data 1
Data 1
Data remains in TDR
Data 1
I/O signal
output
In case of normal transmission: TEND flag is set
In case of transmit error:
ERS flag is set
Steps 2 and 3 above are repeated until the
TEND flag is set.
Note: When the ERS flag is set, it should be cleared until transfer of the last bit (D7 in LSB-first
transmission, D0 in MSB-first transmission) of the retransmit data to be transmitted next has
been completed.
Figure 13.6 Relation Between Transmit Operation and Internal Registers
I/O data
Ds Da Db Dc Dd De Df Dg Dh Dp
DE
TXI (TEND
interrupt)
12.5 etu
Guard time
When GM = 0
11.0 etu
When GM = 1
Figure 13.7 Timing of TEND Flag Setting
Rev.4.00 Aug. 20, 2007 Page 401 of 638
REJ09B0395-0400