R01UH0823EJ0100 Rev.1.00
Page 1406 of 1823
Jul 31, 2019
RX23W Group
38. Serial Peripheral Interface (RSPIa)
(3) Initialization Flowchart
is a flowchart illustrating an example of initialization in clock synchronous operation when the RSPI is
used in slave mode. For a description of how to set up the interrupt controller, DMAC, and I/O ports, refer to the
descriptions given in the individual blocks.
Figure 38.47
Example of Initialization Flowchart in Slave Mode (Clock Synchronous Operation)
(4) Flow of Software Processing
Software processing during clock-synchronous slave operation is the same as that for SPI slave operation. For details,
refer to
,
. Note that mode fault errors will not occur.
Set RSPI data control
register (SPDCR)
Set RSPI command register 0
(SPCMD0)
Set I/O ports
Set RSPI control register
(SPCR)
Set interrupt controller
Set DMAC
• Sets number of frames to be used.
(when using an interrupt)
(when using the DMAC)
• Sets MSB or LSB first.
• Sets data length.
• Sets clock phase.
• Sets clock polarity.
• Sets slave mode.
• Sets interrupt mask.
• Sets RSPI mode.
Set RSPI control register 2 (SPCR2)
• Sets parity function.
• Sets interrupt mask.
Read RSPI control register (SPCR)
Start of initialization in
slave mode
End of initialization in
slave mode
