Renesas R5S72643 User Manual

 

Section 18   Serial Sound Interface 

 

R01UH0134EJ0400  Rev. 4.00  

 

Page 907 of 2108 

Sep 24, 2014 

 

 

 
SH7262 Group, SH7264 Group 

28 TOIRQ 

0  R/(W)* Transmit Overflow Error Interrupt Status Flag 

This status flag indicates that transmit data was 
supplied at a higher rate than was required. 

This bit is set to 1 regardless of the value of the TOIEN 
bit and can be cleared by writing 0 to this bit. 

If TOIRQ = 1 and TOIEN = 1, an interrupt occurs. 

If TOIRQ = 1, SSIFTDR had data written to it while the 
transmit FIFO is full (TDC = H'8). This will lead to the 
loss of data and a potential corruption of multi-channel 
data. 

27 RUIRQ 

0  R/(W)* Receive Underflow Error Interrupt Status Flag 

This status flag indicates that receive data was supplied 
at a lower rate than was required. 
This bit is set to 1 regardless of the value of the RUIEN 
bit and can be cleared by writing 0 to this bit. 
If RUIRQ = 1 and RUIEN = 1, an interrupt occurs. 

If RUIRQ = 1, SSIFRDR was read while the receive 
FIFO is empty (RDC = H'0).This can cause invalid 
receive data to be stored, which may lead to corruption 
of multi-channel data. 

26 ROIRQ 

0  R/(W)* Receive Overflow Error Interrupt Status Flag 

This status flag indicates that receive data was supplied 
at a higher rate than was required. 

This bit is set to 1 regardless of the value of the ROIEN 
bit and can be cleared by writing 0 to this bit. 

If ROIRQ = 1 and ROIEN = 1, an interrupt occurs. 

If ROIRQ = 1, SSIRDR was not read before there was 
new unread data written to it. This will lead to the loss 
of data and a potential corruption of multi-channel data.

Note: When an overflow error occurs, the current data 

in the data buffer of this module is overwritten by 
the next incoming data from the SSI interface.