D12320VF25V Datasheet, PDF (543/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

13.3 Operation
Section 13 Smart Card Interface
13.3.1 Overview
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
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. (This does not apply to block transfer mode.)
• If the error signal is sampled during transmission, the same data is transmitted automatically
after the elapse of 2 etu or longer. (This does not apply to block transfer mode.)
• Only asynchronous communication is supported; there is no synchronous communication
function.
Rev.7.00 Feb. 14, 2007 page 509 of 1108
REJ09B0089-0700