CHAPTER 10 SERIAL INTERFACE FUNCTION
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10.5 3-Wire Variable-Length Serial I/O (CSI4)
CSI4 has the following two operation modes.
(1) Operation stop mode
This mode is used when serial transfers are not performed.
(2) 3-wire variable-length serial I/O mode (MSB/LSB first switchable)
This mode transfers variable data of 8 to 16 bits via three lines: serial clock (SCK4), serial output (SO4), and
serial input (SI4).
Since the data can be transmitted and received simultaneously in the 3-wire variable-length serial I/O mode, the
processing time of data transfer is shortened.
MSB and LSB can be switched for the first bit of data to be transferred in serial.
The 3-wire variable-length serial I/O mode is useful when connecting to a peripheral I/O device that includes a
clocked serial interface, a display controller, etc.
10.5.1 Configuration
CSI4 includes the following hardware.
Table 10-11. Configuration of CSI4
Item
Configuration
Register
Variable-length serial I/O shift register 4 (SIO4)
Control registers
Variable-length serial control register 4 (CSIM4)
Variable-length serial setting register 4 (CSIB4)
Baud rate generator source clock selection register 4 (BRGCN4)
Baud rate generator output clock selection register 4 (BRGCK4)
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