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R01UH0823EJ0100 Rev.1.00 Page 1101 of 1823

Jul 31, 2019

RX23W Group 33. Serial Communications Interface (SCIg, SCIh)

Figure 33.77 Example of Flowchart for Transition to Software Standby Mode during Transmission

Start data transmission

Initialization

SCR.TE = 1

SCR.TE bit = 0

Make transition to software standby mode

Cancel software standby mode

Yes

All data transmitted?

SSR.TEND = 1

Change operating mode?

Data transmission

[ 1 ]

[ 4 ]

Read TEND flag in SSR

Make the I/O port function settings

[ 2 ]

[ 3 ]

[ 1 ] Data being transmitted is lost halfway. Data can be

normally transmitted from the CPU by setting the

TE bit in SCR to 1, reading SSR, and writing data to

TDR after canceling software standby mode.

However, if the DMAC or DTC has been activated,

the data remaining in the DMAC or DTC will be

transmitted when both the TE and TIE bits in SCR

are set to 1.

[ 2 ] Make the I/O port function settings to switch the

TXDn pin to operate as a general I/O port.

[ 3 ] Set the TIE and TEIE bits in the SCR if they are

currently set to 1.

[ 4 ] This includes the setting for the module stop state.

Renesas RX Series User Manual

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