Figure 15.22 Data Formats In Normal Smart Card Interface Mode; Figure 15.23 Direct Convention (Sdir = Sinv = O/E = 0); Figure 15.24 Inverse Convention (Sdir = Sinv = O/E = 1) - Renesas H8S Series Hardware Manual

Section 15 Serial Communication Interface (SCI, IrDA)
In normal transmission/reception
Ds
When a parity error is generated
Ds
Legend
Ds:
D0 to D7 :
Dp:
DE:

Figure 15.22 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.
(Z)

Figure 15.23 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 15.23. 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.
(Z)

Figure 15.24 Inverse Convention (SDIR = SINV = O/E = 1)

Rev. 3.00 Jul. 14, 2005 Page 482 of 986
REJ09B0098-0300
D0 D1 D2 D3
Output from the transmitting station
D0 D1 D2 D3
Output from the transmitting station
Start bit
Data bits
Parity bit
Error signal
A Z Z A Z
Ds D0 D1 D2 D3
A Z Z A A
Ds D7 D6 D5 D4
D4 D5 D6 D7
D4 D5 D6 D7
Z Z A A Z
D4 D5 D6 D7 Dp
A A A A Z
D3 D2 D1 D0 Dp
Dp
Dp DE
Output from
the receiving station
(Z) state
(Z) state