HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 529

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

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)
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)
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).
(Z)
(Z)
Ds
Ds
A
A
D0
D7
Z
Z
D1
D6
Z
Z
D2
D5
A
A
D3
D4
A
Z
D4
D3
Z
A
D5
D2
Z
A
Rev.3.00 Mar. 26, 2007 Page 487 of 772
D6
D1
A
A
Section 13 Smart Card Interface
D7
D0
A
A
Dp
Dp
Z
Z
(Z)
(Z)
REJ09B0355-0300
State
State