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(a) Starting procedure
The procedure for starting continuous transmission is shown below.
Figure 11-5. Continuous Transmission Starting Procedure
TXDn (output)
<1>
INTSTn (output)
TXBn register
TXSn register
ASIFn register
(TXBFn and TXSFn bits)
Note Because this period is a period of transition from "10" to "01", "11" or "00" may be read if the TXBFn
and TXSFn bits of the ASIFn register are simultaneously read. Therefore, use only the TXBFn bit to
judge whether data can be written to the TXBn register.
Remark n = 0 to 2
Transmission starting procedure
• Set transmission mode
• Write data (1)
• Read ASIFn register (confirm that TXBFn bit = 0)
• Write data (2)
• Read ASIFn register (confirm that TXBFn bit = 0)
• Write data (3)
• Read ASIFn register (confirm that TXBFn bit = 0)
• Write data (4)
Note Transition period
CHAPTER 11 SERIAL INTERFACE FUNCTION
Start
bit
Data (1)
<2>
Data (1)
FFH
FFH
Data (1)
00
10
01
Note
<1> Start transmission unit
<2> Generate start bit
<3> Generate INTSTn interrupt
<4> Generate start bit
<5> Generate INTSTn interrupt
User's Manual U14359EJ4V0UM
Start
Stop
bit
bit
<3>
<4>
Data (2)
Data (2)
11
01
Internal operation
Start data (1) transmission
<<Transmission in progress>>
Start data (2) transmission
<<Transmission in progress>>
Stop
Data (2)
bit
<5>
Data (3)
Data (3)
11
01
11
ASIFn register
TXBFn
TXSFn
0
0
1
0
Note
1
1/0
Note
0
1/0
0
1
0
1
1
1
0
1
0
1
1
1
0
1
0
1
1
1
375
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