NEC PD78058FY(A) - Manual (Page 331)

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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78058F SUBSERIES)
16.4.4 2-wire serial I/O mode operation
The 2-wire serial I/O mode can cope with any communication format by program.
Communication is basically carried out with two lines of serial clock (SCK0) and serial data input/output (SB0 or
SB1).
Figure 16-31. Serial Bus Configuration Example Using 2-Wire Serial I/O Mode
(1) Register setting
The 2-wire serial I/O mode is set with the serial operating mode register 0 (CSIM0), serial bus interface control
register (SBIC), and interrupt timing specify register (SINT).
(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.
Master
SCK0
Slave
SB0 (SB1)
SCK0
SB0 (SB1)
AV DD AV DD