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(b) Ending procedure
The procedure for ending continuous transmission is shown below.
TXDn (output)
INTSTn (output)
TXBn register
TXSn register
ASIFn register
(TXBFn and TXSFn bits)
UARTCAEn bit or TXEn bit
Remark n = 0 to 2
Transmission ending procedure
• Read ASIFn register (confirm that the TXBFn bit = 0)
• Write data (n)
• Read ASIFn register (confirm that the TXSFn bit = 1)
There is no write data
• Read ASIFn register (confirm that the TXSFn bit = 0)
• Clear (0) the UARTCAEn bit or TXEn bit
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CHAPTER 11 SERIAL INTERFACE FUNCTION
Figure 11-6. Continuous Transmission Ending Procedure
Start
bit
<6>
<7>
<8>
Data (m – 1)
Data (m – 1)
11
01
User's Manual U14359EJ4V0UM
Stop
Data (m – 1)
bit
<9>
Data (m)
11
Internal operation
<6> Transmission of data (m − 2) is in progress
<7> Generate INTST interrupt
<8> Generate start bit
Start data (m − 1) transmission
<<Transmission in progress>>
<9> Generate INTSTn interrupt
<10> Generate start bit
Start data (m) transmission
<<Transmission in progress>>
<11> Generate INTSTn interrupt
Initialize internal circuits
Start
Stop
Data (m)
bit
bit
<10>
<11>
Data (m)
01
ASIFn register
TXBFn
1
0
0
1
0
0
0
0
FFH
00
TXSFn
1
1
1
1
1
1
0
0
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