Renesas H8S Family, Hardware Manual

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Section 13 Serial Communication Interface (SCI)
Rev. 1.00 Mar. 12, 2008 Page 476 of 1178
REJ09B0403-0100
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
In normal transmission/reception
Output from the transmitting station
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
When a parity error is generated
Output from the transmitting station
DE
Output from
the receiving station
[Legend]
Ds: Start bit
D0 to D7: Data bits
Dp:
Parity bit
DE: Error signal
Figure 13.22 Data Formats in Normal Smart Card Interface Mode
For communication with the IC cards of the direct convention and inverse convention types,
follow the procedure below.
Ds
A Z Z A Z Z Z Z A A (Z) (Z) state
D0 D1 D2 D3 D4 D5 D6 D7 Dp
Figure 13.23 Direct Convention (SDIR = SINV = O/
E
= 0)
For the direct convention type, logic levels 1 and 0 correspond to states Z and A, respectively, and
data is transferred with LSB-first as the start character, as shown in figure 13.23. Therefore, data
in the start character in the figure is H'3B. When using the direct convention type, write 0 to both
the SDIR and SINV bits in SCMR. Write 0 to the O/
E
bit in SMR in order to use even parity,
which is prescribed by the smart card standard.
Ds
A Z Z A A A Z A A A (Z) (Z) state
D7 D6 D5 D4 D3 D2 D1 D0 Dp
Figure 13.24 Inverse Convention (SDIR = SINV = O/
E
= 1)