325
Chapter 12
Serial Interface Function
Preliminary User’s Manual U14913EE1V0UM00
(b) Ending procedure
Figure 12-10: Continuous Transmission End Procedure
Transmission End Procedure
Internal Operation
ASIFn Register
TXBF
Bit
TXSF
Bit
<1> Transmission of data (n - 2) is in
progress
1
1
<2> Generate transmission
completion interrupt (INTSTn)
0
1
<3> Read ASIFn register (confirm that TXBF bit = 0)
Write data (n)
1
1
<4> Generate start bit
Start data (n - 1) transmission
<<Transmission in progress>>
<5> Generate transmission
completion interrupt (INTSTn)
0
1
<6> Read ASIFn register (confirm that TXSF bit = 1)
There is no write data
<7> Generate start bit
Start data (n) transmission
<<Transmission in progress>>
<8> Generate transmission
completion interrupt (INTSTn)
0
0
<9> Read ASIFn register (confirm that TXSF bit = 0)
Clear (0) the CAE bit or TXE bit of ASIMn
register
Initialize internal circuits
Start
Start
Parity
Parity
Parity
Data (n
−
1)
Data
(n
−
2)
Data (n)
Stop
Stop
Stop
11
00
01
11
01
Data (n)
FFH
Data (n
−
1)
Data (n
−
1)
Data (n)
TXDn
(output)
INTSTn
(output)
TXBn
register
Transmission
shift register
ASIFn register
(TXBF, TXSF
bits)
CAE bit or
TXE bit
<
1
>
<
3
>
<
2
>
<
4
>
5
>
<
6
> <
7
>
9
>
<
8
>
<
<
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