E202075_HD404889 Datasheet, PDF (118/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Idle high/low control:
When the serial interface is in the STS instruction wait state or the serial clock wait state (i.e. when idle),
the output level of the SO pin can be set arbitrarily by software. Idle high/low control is performed by
writing the output level to bit 1 (SMR21) of serial mode register 2 (SMR2).
An example of idle high/low control is shown in figure 64. Idle high/low control cannot be performed in
the transfer state.
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