R01UH0823EJ0100 Rev.1.00 Page 1022 of 1823
Jul 31, 2019
RX23W Group 33. Serial Communications Interface (SCIg, SCIh)
33.3.5 CTS and RTS Functions
The CTS function is the use of input on the CTSn# pin in transmission control. 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 transmission to
start.
Applying the high level to the CTS# pin while transmission is in progress does not affect transmission of the current
frame, which continues.
In the RTS function, by using the function of output on the RTSn# pin, a low level is output when reception becomes
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 bit is 1
Reception is not in progress
There are no received data yet to be read
The ORER, FER, and PER flags in the SSR are all 0
[Condition for high-level output]
When the conditions for low-level output are not satisfied
Note that either one of CTS and RTS can be selected.
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