Renesas R5S72621 Manual De Usuario
Section 16 Renesas Serial Peripheral Interface
Page 810 of 2108
R01UH0134EJ0400 Rev. 4.00
Sep
24,
2014
SH7262 Group, SH7264 Group
16.4.3
System Configuration Example
(1) Master/Slave (with This LSI Acting as Master)
Figure 16.2 shows a master/slave system configuration example when this LSI is used as a master.
In master/slave configuration, the SSL output of this LSI (master) is not used. The SSL input of
the slave is fixed to the low level, and the slave is always maintained in a selected state. In the
transfer format corresponding to the case where the CPHA bit in the control register (SPCR) is 0,
there are slave devices for which the SSL signal cannot be fixed to the active level. In situations
where the SSL signal cannot be fixed, the SSL output of this LSI should be connected to the SSL
input of the slave device.
In master/slave configuration, the SSL output of this LSI (master) is not used. The SSL input of
the slave is fixed to the low level, and the slave is always maintained in a selected state. In the
transfer format corresponding to the case where the CPHA bit in the control register (SPCR) is 0,
there are slave devices for which the SSL signal cannot be fixed to the active level. In situations
where the SSL signal cannot be fixed, the SSL output of this LSI should be connected to the SSL
input of the slave device.
This LSI (master) always drives the RSPCK and MOSI. The slave always drives the MISO.
This LSI (master)
Slave
RSPCK
MOSI
MISO
SSL
RSPCK
MOSI
MISO
SSL
Figure 16.2 Master/Slave Configuration Example (This LSI = Master)