D12320VF25V Datasheet, PDF (548/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 13 Smart Card Interface
Bits CKE1 and CKE0 specify the clock output. When the GM bit in SMR is cleared to 0, set these
bits to B'00 if a clock is not to be output, or to B'01 if a clock is to be output. When the GM bit in
SMR is set to 1, clock output is performed. The clock output can also be fixed high or low.
Smart Card Mode Register (SCMR) Settings: The SDIR bit is cleared to 0 if the IC card is of
the direct convention type, and set to 1 if of the inverse convention type.
The SINV bit is cleared to 0 if the IC card is of the direct convention type, and set to 1 if of the
inverse convention type.
The SMIF bit is set to 1 when the smart card interface is used.
Examples of register settings and the waveform of the start character are shown below for the two
types of IC card (direct convention and inverse convention).
• Direct convention (SDIR = SINV = O/E = 0)
(Z) A Z Z A Z Z Z A A Z (Z) State
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
With the direct convention type, the logic 1 level corresponds to state Z and the logic 0 level to
state A, and transfer is performed in LSB-first order. The start character data above is H'3B.
The parity bit is 1 since even parity is stipulated for the smart card.
• Inverse convention (SDIR = SINV = O/E = 1)
(Z) A Z Z A A A A A A Z (Z) State
Ds D7 D6 D5 D4 D3 D2 D1 D0 Dp
With the inverse convention type, the logic 1 level corresponds to state A and the logic 0 level
to state Z, and transfer is performed in MSB-first order. The start character data above is H'3F.
The parity bit is 0, corresponding to state Z, since even parity is stipulated for the smart card.
With the chip, inversion specified by the SINV bit applies only to the data bits, D7 to D0. For
parity bit inversion, the O/E bit in SMR should be set to odd parity mode (the same applies to
both transmission and reception).
Rev.7.00 Feb. 14, 2007 page 514 of 1108
REJ09B0089-0700