Figure 15.26 Data Re-Transfer Operation In Sci Transmission Mode; Figure 15.27 Tend Flag Set Timings During Transmission - Renesas H8S Series Hardware Manual

Section 15 Serial Communication Interface (SCI, IrDA)
nth transfer frame
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp DE
TDRE
Transfer from TDR to TSR
TEND
FER/ERS

Figure 15.26 Data Re-transfer Operation in SCI Transmission Mode

Note that the TEND flag is set in different timings depending on the GM bit setting in SMR,
which is shown in figure 15.27.
I/O data
TXI
(TEND interrupt)
GM = 0
GM = 1
[Legend]
Ds: Start bit
D0 to D7: Data bits
Dp: Parity bit
DE: Error signal
etu: Element Time Unit (time taken to transfer one bit)

Figure 15.27 TEND Flag Set Timings during Transmission

Rev. 3.00 Jul. 14, 2005 Page 486 of 986
REJ09B0098-0300
Ds D0 D1 D2 D3 D4 D5 D6 D7 Dp
Transfer from TDR to TSR
[2]
[1]
Ds D0 D1 D2 D3
11.0 etu
Retransfer frame
(DE)
D4 D5 D6 D7 Dp
12.5 etu
(n + 1) th
transfer frame
Ds D0 D1 D2 D3 D4
Transfer from TDR to TSR
[3]
[3]
DE
Guard time