HD6473032F16 Datasheet, PDF (537/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 14 Smart Card Interface
Smart Card Mode Register (SCMR): If the smart card follows the direct convention, clear the
SDIR and SINV bits to 0. If the smart card follows the indirect convention, set the SDIR and
SINV bits to 1. To use the smart card interface, set the SMIF bit to 1.
The register settings and examples of starting character waveforms are shown below for two smart
cards, one following the direct convention and one the 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
In the direct convention, state Z corresponds to logic level 1, and state A to logic level 0.
Characters are transmitted and received LSB-first. In the example above the first character data
is H'3B. The parity bit is 1, following the even parity rule designated for smart cards.
• 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
In the inverse convention, state A corresponds to the logic level 1, and state Z to the logic level
0. Characters are transmitted and received MSB-first. In the example above the first character
data is H'3F. Following the even parity rule designated for smart cards, the parity bit logic
level is 0, corresponding to state Z.
In the H8/3052BF, the SINV bit inverts only the data bits D7 to D0. The parity bit is not inverted,
so the O/E bit in SMR must be set to odd parity mode. This applies in both transmitting and
receiving.
Rev. 3.00 Mar 21, 2006 page 507 of 814
REJ09B0302-0300