System Configuration Example - NEC V850ES/SA2 UPD703201 Manual

12.3.6 System configuration example

CSIn performs 8-bit length data transfer using three signal lines: a serial clock (SCKn), serial input (SIn), and serial
output (SOn). This is effective when connecting peripheral I/O that incorporate a conventional clocked serial interface,
or a display controller to the V850ES/SA2 or V850ES/SA3 (n = 0 to 3 (V850ES/SA2), n = 0 to 4 (V850ES/SA3)).
When connecting the V850ES/SA2 or V850ES/SA3 to several devices, lines for handshake are required.
Since the first communication bit can be selected as MSB or LSB, communication with various devices can be
achieved.
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CHAPTER 12 SERIAL INTERFACE FUNCTION
Figure 12-20. System Configuration Example of CSI
(3-wire serial I/O
Master CPU
SCK
SO
SI
Port (interrupt)
Port
Preliminary User's Manual U15905EJ1V0UD
3-wire serial I/O)
Slave CPU
SCK
SI
SO
Port
Port (interrupt)