R01UH0823EJ0100 Rev.1.00
Page 1071 of 1823
Jul 31, 2019
RX23W Group
33. Serial Communications Interface (SCIg, SCIh)
33.7.7
Recovery from Bus Hang-up
If the bus is stuck by an abnormal state in SCI because of the communication error, reset the SCI according to the
following steps and release the bus.
(1) Set the SCR.TE and RE bit to 0 at the same time to reset SCI.
(2) Set the SIMR3 register to F0h to release the bus.
(3) If the SSR.RDRF flag is 1, dummy-read the RDR register to clear the flag.
(4) Set the SCR.TE and RE bit to 1 at the same time.