H8SX1663 datasheet(775/1158 Pages) RENESAS

775 / 1158 page

Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 723 of 1102

REJ09B0294-0100

15.7.2

Data Format (Except in Block Transfer Mode)

Figure 15.25 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 at least 2 etu.

In normal transmission/reception

Output from the transmitting station

When a parity error is generated

Output from the transmitting station

Output from

the receiving station

[Legend]

Ds:

Start bit

D0 to D7: Data bits

Dp:

Parity bit

DE:

Error signal

Figure 15.25 Data Formats in Normal Smart Card Interface Mode

For communication with the smart cards of the direct convention and inverse convention types,

follow the procedure below.

(Z)

(Z) state

Figure 15.26 Direct Convention (SDIR = SINV = O/

E = 0)

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