RL78/G1P
CHAPTER 11 SERIAL ARRAY UNIT
R01UH0895EJ0100 Rev.1.00
463
Nov 29, 2019
11.7.5 Procedure for processing errors that occurred during UART (UART0) communication
The procedure for processing errors that occurred during UART (UART0) communication is described in Figures 11-
120 and 11-121.
Figure 11-120. Processing Procedure in Case of Parity Error or Overrun Error
Software Manipulation
Hardware Status
Remark
Reads serial data register mn
(SDRmn).
The BFFmn bit of the SSRmn register
is set to 0 and channel n is enabled to
receive data.
This is to prevent an overrun error if the
next reception is completed during error
processing.
Reads serial status register mn
(SSRmn).
Error type is identified and the read
value is used to clear error flag.
Writes 1 to serial flag clear trigger
register mn (SIRmn).
Error flag is cleared.
Error can be cleared only during
reading, by writing the value read from
the SSRmn register to the SIRmn
register without modification.
Figure 11-121. Processing Procedure in Case of Framing Error
Software Manipulation
Hardware Status
Remark
Reads serial data register mn
(SDRmn).
The BFFmn bit of the SSRmn register
is set to 0 and channel n is enabled to
receive data.
This is to prevent an overrun error if the
next reception is completed during error
processing.
Reads serial status register mn
(SSRmn).
Error type is identified and the read
value is used to clear error flag.
Writes serial flag clear trigger register mn
(SIRmn).
Error flag is cleared.
Error can be cleared only during
reading, by writing the value read from
the SSRmn register to the SIRmn
register without modification.
Sets the STmn bit of serial channel stop
register m (STm) to 1.
The SEmn bit of serial channel enable
status register m (SEm) is set to 0 and
channel n stops operating.
Synchronization with other party of
communication
Synchronization with the other party of
communication is re-established and
communication is resumed because it is
considered that a framing error has
occurred because the start bit has been
shifted.
Sets the SSmn bit of serial channel start
register m (SSm) to 1.
The SEmn bit of serial channel enable
status register m (SEm) is set to 1 and
channel n is enabled to operate.
Remark
m: Unit number (m = 0), n: Channel number (n = 0, 1), mn = 00, 01