HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 708

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 15 Smart Card Interface
15.3
15.3.1
The main functions of the smart card interface are as follows.
• One frame consists of 8-bit data plus a parity bit.
• In transmission, a guard time of at least 2 etu (1 etu in block transfer mode) (elementary time
• If a parity error is detected during reception, a low error signal level is output for one etu
• If the error signal is sampled during transmission, the same data is transmitted automatically
• Only asynchronous communication is supported; there is no synchronous communication
15.3.2
Figure 15.2 shows a schematic diagram of smart card interface related pin connections.
In communication with an IC card, since both transmission and reception are carried out on a
single data communication line, the chip’s TxD pin and RxD pin should both be connected to the
line, as shown in the figure. The data communication line should be pulled up to the V
supply with a resistor.
When the clock generated on the smart card interface is used by an IC card, the SCK pin output is
input to the CLK pin of the IC card. No connection is needed if the IC card uses an internal clock.
Chip port output is used as the reset signal.
Other pins must normally be connected to the power supply or ground.
Rev.6.00 Sep. 27, 2007 Page 678 of 1268
REJ09B0220-0600
unit: the time for transfer of 1 bit) is left between the end of the parity bit and the start of the
next frame.
period, 10.5 etu after the start bit. (This does not apply to block transfer mode.)
after the elapse of 2 etu or longer. (This does not apply to block transfer mode.)
function.
Overview
Pin Connections
Operation
CC
power