Data Format (Except For Block Transfer Mode); Figure 14.22 Normal Smart Card Interface Data Format; Figure 14.23 Direct Convention (Sdir = Sinv = O/E = 0) - Renesas H8S Series Hardware Manual

14.7.2

Data Format (Except for Block Transfer Mode)

Figure 14.22 shows the transfer data format in Smart Card interface mode.
• One frame consists of 8-bit data plus a parity bit in asynchronous mode.
• In transmission, a guard time of at least 2 etu (Elementary Time Unit: the time for transfer of 1
bit) is left between the end of the parity bit and the start of the next frame.
• If a parity error is detected during reception, a low error signal level is output for one etu
period, 10.5 etu after the start bit.
• If an error signal is sampled during transmission, the same data is retransmitted automatically
after a delay of 2 etu or longer.
When there is no parity error
Ds
When a parity error occurs
Ds
Legend:
Start bit
DS:
Data bits
D0 to D7:
Parity bit
Dp:
Error signal
DE:

Figure 14.22 Normal Smart Card Interface Data Format

Data transfer with other types of IC cards (direct convention and inverse convention) are
performed as described in the following.
(Z)
Figure 14.23 Direct Convention (SDIR = SINV = O/E E E E = 0)
D0 D1 D2 D3
Transmitting station output
D0 D1 D2 D3
Transmitting station output
A Z Z A Z
Ds D0 D1 D2 D3
Section 14 Serial Communication Interface (SCI)
D4 D5 D6 D7
D4 D5 D6 D7
Z Z A A Z
D4 D5 D6 D7 Dp
Rev. 6.00 Mar 15, 2006 page 365 of 570
Dp
Dp DE
Receiving station
output
(Z) state
REJ09B0211-0600