R01UH0822EJ0100 Rev.1.00
Page 668 of 1041
Jul 31, 2019
RX13T Group
23. Serial Communications Interface (SCIg, SCIh)
23.6.2
Data Format (Except in Block Transfer Mode)
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 1 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 retransmitted after at least 2 etu.
Figure 23.33
Data Formats in Smart Card Interface Mode
Ds
D0
D1
D2
D3
D4
D5
D6
D7
Dp
In normal transmission/reception
Output from the transmitting station
Ds
D0
D1
D2
D3
D4
D5
D6
D7
Dp
When a parity error occurs
Output from the transmitting station
DE
Output from the
receiving station
Ds:
Start bit
D0 to D7: Data bits
Dp:
Parity bit
DE:
Error signal