Filter
Top Products
Section 16 Renesas Serial Peripheral Interface
R01UH0134EJ0400 Rev. 4.00 Page 811 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
(2) Master/Slave (with This LSI Acting as Slave)
Figure 16.3 shows a master/slave system configuration example when this LSI is used as a slave.
When this LSI is to operate as a slave, the SSL pin is used as SSL input. The master always drives
the RSPCK and MOSI. This LSI (slave) always drives the MISO. When SSL is at the non-active
level, the pin state is Hi-Z.
In the slave configuration in which the CPHA bit in the command register (SPCMD) is set to 1,
the SSL input of this LSI (slave) is fixed to the 0 level, this LSI (slave) is always maintained in a
selected state, and in this manner it is possible to execute serial transfer (figure 16.4).
This LSI (slave)
RSPCK
MOSI
MISO
SSL
Master
RSPCK
MOSI
MISO
SSL
Figure 16.3 Master/Slave Configuration Example (This LSI = Slave)
This LSI (slave, CPHA = 1)
RSPCK
MOSI
MISO
SSL
Master
RSPCK
MOSI
MISO
SSL
Figure 16.4 Master/Slave Configuration Example
(This LSI = Slave, CPHA = 1)