Renesas R5S72643 User Manual

 

Section 15   Serial Communication Interface with FIFO 

 

R01UH0134EJ0400  Rev. 4.00  

 

Page 757 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

  Receiving Serial Data (Asynchronous Mode) 

Figures 15.7 and 15.8 show sample flowcharts for serial reception. 

Use the following procedure for serial data reception after enabling reception. 

Start of reception

Read ER, DR, BRK flags in

SCFSR and ORER

flag in SCLSR

ER, DR, BRK or ORER = 1?

Read RDF flag in SCFSR

RDF = 1?

Read receive data in

SCFRDR, and clear RDF

flag in SCFSR to 0

All data received?

Clear RE bit in SCSCR to 0

End of reception

Yes

No

Yes

Yes

No

No

Error handling

[1] Receive error handling and 

break detection: 

      Read the DR, ER, and BRK 

flags in SCFSR, and the 
ORER flag in SCLSR, to 
identify any error, perform the 
appropriate error handling, 
then clear the DR, ER, BRK, 
and ORER flags to 0. In the 
case of a framing error, a 
break can also be detected by 
reading the value of the RxD 
pin.

[2]  Status check and receive data 

read: 

      Read SCFSR and check that 

RDF flag = 1, then read the 
receive data in SCFRDR, read 
1 from the RDF flag, and then 
clear the RDF flag to 0. The 
transition of the RDF flag from 
0 to 1 can also be identified by 
a receive FIFO data full 
interrupt (RXI).

[3]  Serial reception continuation 

procedure: 

      To continue serial reception, 

read at least the receive 
trigger set number of receive 
data bytes from SCFRDR, 
read 1 from the RDF flag, then 
clear the RDF flag to 0. The 
number of receive data bytes 
in SCFRDR can be 
ascertained by reading from 
SCRFDR.

[1]

[2]

[3]