HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 442
HD6413008F
Manufacturer Part Number
HD6413008F
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6413008F.pdf
(686 pages)
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13. Smart Card Interface
13.3.6
Initialization: Before transmitting or receiving data, the smart card interface must be initialized as
described below. Initialization is also necessary when switching from transmit mode to receive
mode, or vice versa.
1. Clear the TE and RE bits to 0 in the serial control register (SCR).
2. Clear error flags ERS, PER, and ORER to 0 in the serial status register (SSR).
3. Set the parity bit (O/E) and baud rate generator select bits (CKS1 and CKS0) in the serial
4. Set the SMIF, SDIR, and SINV bits in the smart card mode register (SCMR).
5. Set a value corresponding to the desired bit rate in the bit rate register (BRR).
6. Set the CKE0 bit in SCR. Clear the TIE, RIE, TE, RE, MPIE, TEIE, and CKE1 bits to 0. If the
7. Wait at least one bit interval, then set the TIE, RIE, TE, and RE bits in SCR. Do not set the TE
Transmitting Serial Data: As data transmission in smart card mode involves error signal
sampling and retransmission processing, the processing procedure is different from that for the
normal SCI. Figure 13.5 shows a sample transmission processing flowchart.
1. Perform smart card interface mode initialization as described in Initialization above.
2. Check that the ERS error flag is cleared to 0 in SSR.
3. Repeat steps 2 and 3 until it can be confirmed that the TEND flag is set to 1 in SSR.
4. Write the transmit data in TDR, clear the TDRE flag to 0, and perform the transmit operation.
5. To continue transmitting data, go back to step 2.
6. To end transmission, clear the TE bit to 0.
The above processing may include interrupt handling.
If transmission ends and the TEND flag is set to 1 while the TIE bit is set to 1 and interrupt
requests are enabled, a transmit-data-empty interrupt (TXI) will be requested. If an error occurs in
transmission and the ERS flag is set to 1 while the RIE bit is set to 1 and interrupt requests are
enabled, a transmit/receive-error interrupt (ERI) will be requested.
The timing of TEND flag setting depends on the GM bit in SMR.
Rev.4.00 Aug. 20, 2007 Page 398 of 638
REJ09B0395-0400
mode register (SMR). Clear the C/A, CHR, and MP bits to 0, and set the STOP and PE bits to
1.
When the SMIF bit is set to 1, the TxD pin and RxD pin are both switched from port to SCI
pin functions and go to the high-impedance state.
CKE0 bit is set to 1, the clock is output from the SCK pin.
bit and RE bit at the same time, except for self-diagnosis.
The TEND flag is cleared to 0.
Transmitting and Receiving Data
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