R01UH0823EJ0100 Rev.1.00 Page 1362 of 1823
Jul 31, 2019
RX23W Group 38. Serial Peripheral Interface (RSPIa)
38.3.3.3 Single Master/Multi-Slave (with This MCU Acting as Master)
Figure 38.8 shows a single-master/multi-slave RSPI system configuration example when this MCU is used as a master.
In the example of
Figure 38.8, the RSPI system is comprised of this MCU (master) and three slaves (SPI slave 0 to SPI
slave 2).
The RSPCKA and MOSIA outputs of this MCU (master) are connected to the RSPCK and MOSI inputs of SPI slave 0 to
SPI slave 2. The MISO outputs of SPI slave 0 to SPI slave 3 are all connected to the MISOA input of this MCU (master).
SSLA0, SSLA1, and SSLA3 outputs of this MCU (master) are connected to the SSL inputs of SPI slave 0 to SPI slave 2,
respectively.
This MCU (master) drives RSPCKA, MOSIA, SSLA0, SSLA1, and SSLA3. Of the SPI slave 0 to SPI slave 2, the slave
that receives low-level input into the SSL input drives MISO.
Figure 38.8 Single-Master/Multi-Slave Configuration Example (This MCU = Master)
RSPCK
MOSI
MISO
SSL0
SSL1
SSL2
SPCK
MOSI
MISO
SPCK
MOSI
MISO
SPCK
MOSI
MISO
This MCU (master) SPI slave 0
SPI slave 1
SPI slave 2
SSL
SSL
SSL
RSPCKA
MOSIA
MISOA
SSLA0
SSLA1
SSLA3
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