SH7721 datasheet(1070/1524 Pages) RENESAS

1070 / 1524 page

Section 30

SIM Card Module (SIM)

Rev. 3.00 Jan. 18, 2008 Page 1008 of 1458

REJ09B0033-0300

3. The smart card interface then returns the data line to high impedance. The data line is held at

high level by the pull-up resistance.

4. The receive side performs a parity check.

If there is no parity error and reception is normal, reception of the next frame is awaited,

without further action.

On the other hand, when a parity error has occurred in T = 0 mode, an error signal (DE: low

level) is output, requesting data retransmission. After output of an error signal with the

specified duration, the receive side again sets the signal line to the high-impedance state. The

signal line returns to high level by means of the pull-up resistance. If in T = 1 mode, however,

no error signal is output even if a parity error occurs.

5. If the transmit side does not receive an error signal, the next frame is transmitted.

On the other hand, if in T = 0 mode and an error signal is received, the data for which the error

occurred is retransmitted as in step 2 above. In T = 1 mode, however, error signals are not

received and retransmission is not performed.

30.4.3

Table 30.2 shows a map of the bits in the registers used by the smart card interface.

Bits for which 0 or 1 is shown must always be set to the value shown. The method for setting the

bits other than these is explained below.

SH7721 Datasheet(PDF) 1070 Page - Renesas Technology Corp