Smart Card Interface Description; Sample Connection; Data Format (Except In Block Transfer Mode); Figure 15.21 Pin Connection For Smart Card Interface - Renesas H8S Series Hardware Manual

15.7

Smart Card Interface Description

The SCI supports the IC card (smart card) interface based on the ISO/IEC 7816-3 (Identification
Card) standard as an enhanced serial communication interface function. Smart card interface mode
can be selected using the appropriate register.
15.7.1

Sample Connection

Figure 15.21 shows a sample connection between the smart card and this LSI. As in the figure,
since this LSI communicates with the IC card using a single transmission line, interconnect the
TxD and RxD pins and pull up the data transmission line to VCC using a resistor. Setting the RE
and TE bits in SCR to 1 with the IC card not connected enables closed transmission/reception
allowing self diagnosis. To supply the IC card with the clock pulses generated by the SCI, input
the SCK pin output to the CLK pin of the IC card. A reset signal can be supplied via the output
port of this LSI.

Figure 15.21 Pin Connection for Smart Card Interface

15.7.2

Data Format (Except in Block Transfer Mode)

Figure 15.22 shows the data transfer formats in smart card interface mode.
• One frame contains 8-bit data and a parity bit in asynchronous mode.
• During transmission, at least 2 etu (elementary time unit: time required for transferring one bit)
is secured as a guard time after the end of the parity bit before the start of the next frame.
• If a parity error is detected during reception, a low error signal is output for 1 etu after 10.5 etu
has passed from the start bit.
• If an error signal is sampled during transmission, the same data is automatically re-transmitted
after two or more etu.
TxD
RxD
SCK
Rx (port)
This LSI
Main unit of the device
to be connected
Section 15 Serial Communication Interface (SCI, IrDA)
VCC
I/O
Data line
CLK
Clock line
RST
Reset line
Rev. 3.00 Jul. 14, 2005 Page 481 of 986
IC card
REJ09B0098-0300