H8S2245 Datasheet, PDF (529/818 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

Section 13 Smart Card Interface
Smart Card Mode Register (SCMR) Setting
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 in the case of the Smart Card interface.
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 H8S/2245 Group, 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 is set to odd parity mode (the same
applies to both transmission and reception).
Rev.3.00 Mar. 26, 2007 Page 487 of 772
REJ09B0355-0300