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BAT32G1x9 user manual | Chapter 19 Universal serial communication unit
651 / 1149
Rev.1.02
By using the slave selection input function, a master device can be connected to multiple slave devices for
communication. The master device performs the output of the slave selection signal of the slave device (1) of
the communication object, and each slave device determines whether it is selected as the communication
object and controls the output of the SDO pin. When a slave device is selected as a communication object, the
SDO pin can communicate data to the master device; When a slave is not selected as the communication
object, the SDO pin becomes a high-level output, so in an environment where multiple slaves are connected,
the SDO pin needs to be set to Nch-O.D and the node pulled up. In addition, even the serial clock entered into
the master device is not transmitted and received.
Note the Slave selection signal must be output through the operation of the port.
Fig. 19-69
Structural example of the Slave selection input function
SS
SDI
SDO
SCI
SS
SDI
SDO
SCI
SCLK
SS
SDI
SDO
SCI
SCLK
SCLK
Master control
Slave
Slave
Port
Note that the SDO00
pin is selected as the
N-channel open-drain output
mode.