NEC uPD78056Y - Manual (Page 350)

350
CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (
µ
PD78054Y Subseries)
(2) Serial operating mode register 0 (CSIM0)
This register sets serial interface channel 0 serial clock, operating mode, operation enable/stop wake-up
function and displays the address comparator match signal.
CSIM0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM0 to 00H.
Caution Do not switch the operation mode (3-wire serial I/O, 2-wire serial I/O, I 2 C bus) while the
operation of serial interface channel 0 is enabled. Stop the serial operation before switching
the operation mode.