NEC 78K0 Series User Manual page 444

Figure 17-24. Master Operation Flowchart (Multi-Master System) (2/3)
A
Enables reserving communication.
STT0 = 1
Wait
MSTS0 = 1?
Yes
C
B
Disables reserving communication.
IICBSY = 0?
Yes
D
STT0 = 1
Wait
STCF = 0?
Yes
C
444
CHAPTER 17 SERIAL INTERFACE IIC0
Prepares for starting communication
(generates a start condition).
Secure wait time by software
(see Table 17-6).
No
Wait state after stop condition
was detected and start condition
was generated by the communication
reservation function.
No
Prepares for starting communication
(generates a start condition).
Secure wait time by software
(see Table 18-7).
No
Preliminary User's Manual U17260EJ3V1UD
INTIIC0
interrupt occurs?
Yes
No
EXC0 = 1 or COI0 =1?
Yes
Slave operation
INTIIC0
interrupt occurs?
Yes
EXC0 = 1 or COI0 =1?
Yes
Slave operation
No
Waits for bus release
(communication being reserved).
No
Waits for bus release
No
Detects a stop condition.
D