SH7760 Datasheet, PDF (674/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

(4) Smart card mode register (SISCMR) settings
When the IC card is set for the direct convention, both the SDIR and SINV bits are set to 0; for
the inverse convention, both are set to 1. The SMIF bit is always set to 1.
Figure 18.3 shows the register settings and initial character waveform examples for two types of
IC cards (a direct-convention type and an inverse-convention type).
For the direct-convention type, the logical level 1 is assigned to the Z state, and the logical level 0
to the A state, and transmission and reception are performed LSB-first. The data of the above
initial character is then H'3B. Even parity is used according to the smart card specification, and so
the parity bit is 1.
For the inverse-convention type, the logical level 1 is assigned to the A state, and the logical level
0 to the Z state, and transmission and reception are performed MSB-first. The data of the above
initial character is then H’3F.
Even parity is used according to the smart card specification, and so the parity bit is 0, assigned to
the Z state.
Inversion by the SINV bit setting only applies to data bits D7 to D0. To invert the parity bit,
specify odd parity through the SISMR.O/E bit, both for transmission and reception.
(Z) A Z Z A Z Z Z A A Z (Z) _state
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
(a) Direct convention (SDIR = SINV=O/E = 0)
(Z) A Z Z A A A A A A Z (Z) state
Ds D7 D6 D5 D4 D3 D2 D1 D0 Dp
(b) Inverse convention (SDIR = SINV=O/E = 1)
Figure 18.3 Examples of Initial Character Waveforms
Rev. 1.0,02/03, page 624 of 1294