Renesas R5S72621 Manual Do Utilizador

 
Section 21   IEBus

TM

 Controller 

Page 1130 of 2108 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

SH7262 Group, SH7264 Group

0 RXEPE 

0 

R/(W)* Parity 

Error 

Indicates that a parity error has occurred during data 
field reception. If a parity error occurs before data field 
reception, this module immediately enters the wait state 
and the RXEPE flag is not set. 

If a parity error occurs when the maximum number of 
receive bytes in one frame have not been received, the 
RXEPE flag is not set yet. When a parity error occurs, 
this module returns a NAK to the communications 
destination unit via the acknowledge bit. In this case, 
the communications destination unit continues 
retransfer up to the maximum number of receive bytes 
in one frame and if the reception has been completed 
normally by clearing the parity error, the RXEPE flag is 
not set. If the parity error is not cleared when the 
reception is terminated before receiving data for the 
number of bytes specified by the message length, the 
RXEPE flag is set. 

In broadcast reception, if a parity error occurs during 
data field reception, this module enters the wait state 
immediately after setting the RXEPE flag. This flag is 
enabled only after the receive start flag (RXS) is set. If 
this error occurs before the receive start flag is set, this 
module stops communication and enters the wait state. 
This bit is not set in this case. 

[Setting condition] 

  When the parity bit of the last data of the data field 

is not correct after the maximum number of receive 

bytes have been received 

[Clearing condition] 

  When 1 is written 

Note:  *  only 1 can be written to clear the flag.