Renesas RX Series

R01UH0823EJ0100 Rev.1.00 Page 1363 of 1823
Jul 31, 2019
RX23W Group 38. Serial Peripheral Interface (RSPIa)
38.3.3.4 Single Master/Multi-Slave (with This MCU Acting as Slave)
Figure 38.9 shows a single-master/multi-slave RSPI system configuration example when this MCU is used as a slave. In
the example of
Figure 38.9, the RSPI system is comprised of an SPI master and two MCUs (slave X and slave Y).
The SPCK and MOSI outputs of the SPI master are connected to the RSPCKA and MOSIA inputs of the MCUs (slave X
and slave Y). The MISOA outputs of the MCUs (slave X and slave Y) are all connected to the MISO input of the SPI
master. SSLX and SSLY outputs of the SPI master are connected to the SSLA0 inputs of the MCUs (slave X and slave
Y), respectively.
The SPI master drives SPCK, MOSI, SSLX, and SSLY. Of the MCUs (slave X and slave Y), the slave that receives low-
level input into the SSLA0 input drives MISOA.
Figure 38.9 Single-Master/Multi-Slave Configuration Example (This MCU = Slave)
RSPCK
MOSI
MISO
SSL0
SSL1
SSL2
RSPCK
MOSI
MISO
SSL0
SSL1
SSL2
SPCK
MOSI
MISO
SSLX
SPI master This MCU (slave X)
SSLY
This MCU (slave Y)
RSPCKA
MOSIA
MISOA
SSLA0
SSLA1
SSLA3
RSPCKA
MOSIA
MISOA
SSLA0
SSLA1
SSLA3