Data Format (Except In Block Transfer Mode) - Renesas RZ/A Series User Manual

RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group
15.6.2

Data Format (Except in Block Transfer Mode)

Figure 15.26 shows the data transfer formats in smart card interface mode.
• One frame consists of 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 from the end of the parity bit until the start of the next frame.
• If a parity error is detected during reception, a low-level 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
Ds
When a parity error occurs
Ds
Ds: Start bit
D0 to D7: Data bits
Dp: Parity bit
DE: Error signal
Figure 15.26 Data Formats in Smart Card Interface Mode
For communications with IC cards of the direct convention type and inverse convention type, follow the procedure
below.
R01UH0437EJ0600 Rev.6.00
Jan 29, 2021
D0 D1 D2 D3
Output from the transmitting station
D0 D1 D2 D3
Output from the transmitting station
15. Serial Communications Interface
D4 D5 D6 D7
D4 D5 D6 D7
Dp
Dp DE
Output from the
receiving station
15-48