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User’s Manual U12697EJ3V0UM
CHAPTER 17 3-WIRE SERIAL I/O MODE
17.1 Function
This mode transfers 8-bit data by using the three lines of the serial clock (SCK0), the serial output (SO0), and the
serial input (SI0).
Since the 3-wire serial I/O mode can perform simultaneous transmission and reception, the data transfer processing
time becomes shorter.
The starting bit of the 8-bit data to be serially transferred is fixed at the MSB.
The 3-wire serial I/O mode is valid when the peripheral I/O or display controller with an internal clocked serial
interface is connected.
17.2 Configuration
The 3-wire serial I/O mode includes the following hardware.
Figure 17-1 is a block diagram of the clocked serial interface (CSI) in the 3-wire serial I/O mode.
Table 17-1. 3-Wire Serial I/O Configuration
Item
Configuration
Register
Serial I/O shift register 0 (SIO0)
Control register
Serial operation mode register 0 (CSIM0)
