NEC uPD78056Y - Manual (Page 302)

302
CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78054 Subseries)
16.4.2 3-wire serial I/O mode operation
The 3-wire serial I/O mode is valid for connection of peripheral I/O units and display controllers which incorporate
a conventional synchronous clocked serial interface as is the case with the 75X/XL, 78K, and 17K series.
Communication is carried out with three lines of serial clock (SCK0), serial output (SO0), and serial input (SI0).
(1) Register setting
The 3-wire serial I/O mode is set with the serial operating mode register 0 (CSIM0) and serial bus interface
control register (SBIC).
(a) Serial operating mode register 0 (CSIM0)
CSIM0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM0 to 00H.