Fujitsu FR81S User Manual

CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE 

 

 

8. Operation of I2C 

 

FUJITSU SEMICONDUCTOR LIMITED 

CHAPTER : MULTI-FUNCTION SERIAL INTERFACE 

FUJITSU SEMICONDUCTOR CONFIDENTIAL 

378 

Figure 8-58 Example of I

2

C Flowchart (FIFO Memory Not Used)   

(When DMA mode is enable (SSR:DMA=1)) 2/4 

 

Master（TBI interrupt）

IBCR:TRX=1?

Transmission 

complete ?

Yes

No

A

No

Yes

Reception data reading(RDR)

Reception complete ?

Wait setting(IBCR:WSEL=1)
ACK setting(IBCR:ACKE=1)
Writing of dummy data（TDR）

No

Transmission data write(TDR)
Wait setting(IBCR:WSEL)
ACK setting(IBCR:ACKE)

A

Repetition start ?

Transmission data write(TDR)
Repetition start 
setting(IBCR:MSS=SCC=1)
ACK setting(IBCR:ACKE)
Interrupt flag setting 
clear(IBCR:INT=0)

End

No

Yes

Stop setting(IBCR:MSS=0)
ACK setting(IBCR:ACKE)
Interrupt flag setting 
clear(IBCR:INT=0)

Interrupt flag setting
（IBCR:INT）

IBCR:INT=1?

Error processing

End

A

Yes

No

Master data reception

Master data transmission

Yes

 

 

 
 

 

MN705-00010-1v0-E

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