Smart Card Interface Description - Renesas H8S Family Hardware Manual

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.

Sample Connection

Figure 13.21 shows a sample connection between the smart card and this LSI. This LSI

communicates with the IC card using a single transmission line. When the SMIF bit in SCMR is

set to 1, the TxD and RxD pins are interconnected inside the LSI, which makes the RxD pin

function as an I/O pin. 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 13.21 Pin Connection for Smart Card Interface

Data Format (Except in Block Transfer Mode)

Figure 13.22 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.

Main unit of the device

to be connected

Section 13 Serial Communication Interface (SCI)

Rev. 1.00 Mar. 12, 2008 Page 475 of 1178

REJ09B0403-0100