Cts And Rts Functions - Renesas RX100 Series User Manual

RX13T Group
23.5.2

CTS and RTS Functions

In the CTS function, CTSn# pin input is used to control reception/transmission start when the clock source is the internal
clock. Setting the SPMR.CTSE bit to 1 enables the CTS function.
When the CTS function is enabled, placing the low level on the CTSn# pin causes reception/transmission to start.
Applying the high level to the CTS# pin while reception/transmission are in progress does not affect reception/
transmission of the current frame, which continues.
In the RTS function, RTSn# pin output is used to request reception/transmission start when the clock source is an
external synchronizing clock. A low level is output when serial communications become possible. Conditions for output
of the low and high level are shown below.
[Conditions for low-level output]
When the following conditions are all satisfied
 The SCR.RE or SCR.TE bit is 1
 Transmission or reception of data is not in progress
 There are no received data yet to be read (when the SCR.RE bit is 1)
 Transmit data has been written (when the SCR.TE bit is 1)
 The SSR.ORER flag is 0
[Condition for high-level output]
The conditions for low-level output have not been satisfied.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
23. Serial Communications Interface (SCIg, SCIh)
Page 657 of 1041