Renesas RL78/G1P Hardware User Manual page 419

16-bit single-chip microcontroller

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Multiple slaves can be connected to a master and communication can be performed by using the slave select input

function. The master outputs a slave select signal to the slave (one) that is the other party of communication, and each

slave judges whether it has been selected as the other party of communication and controls the SO pin output. When a

slave is selected, transmit data can be communicated from the SO pin to the master. When a slave is not selected, the

SO pin is set to high-impedance output. Therefore, short circuit of the SO pin with SO output of other slave can be

avoided. Furthermore, when a slave is not selected, no transmission/reception operation is performed even if a serial

clock is input from the master.

Caution Output the slave select signal by port manipulation.

Figure 11-75. Example of Slave Select Input Function Configuration

Caution Make sure that V

Select the N-ch open-drain output (V

R01UH0895EJ0100 Rev.1.00

Nov 29, 2019

tolerance) mode for the SO00 pin.

CHAPTER 11 SERIAL ARRAY UNIT