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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(a) Starting procedure
Figure 13-9 shows the procedure to start continuous transmission.
Figure 13-9:
Continuous Transmission Starting Procedure
Note: For a certain time it may happen that the bit combinations of TXBF and TXSF bits 00B or 11B
can be read.
Transmission Starting Procedure
Internal Operation
ASIFn Register
TXBF bit TXSF bit
<1> Set transmission mode
0
0
<2> Write data (1) to TXBn register
1
0
<3> Generate start bit
Start data (1) transmission
Note
0
1
<4> Read ASIFn register (confirm that TXBF bit = 0)
Write data (2)
1
1
<<Transmission in progress>>
<5> Generate transmission
completion interrupt (INTSTn)
0
1
<6> Read ASIFn register (confirm that TXBF bit = 0)
Write data (3)
1
1
<7> Generate start bit
Start data (2) transmission
<<Transmission in progress>>
<8> Generate transmission
completion interrupt (INTSTn)
0
1
<9> Read ASIFn register (confirm that TXBF bit = 0)
Write data (4)
1
1
Start
Start
Parity
Parity
Data (1)
Data (2)
Stop
Stop
FFH
Data (3)
FFH
00
01
01
01
10
<
1
>
<
2
>
<
3
>
<
4
>
<
5
> <
6
> <
7>
8
> <
9
>
11
11
11
Data (2)
Data (1)
Data (2)
TXD5n
(output)
INTST5n
(output)
TXB5n
register
Transmission shift
register
ASIF5n register
(TXBF, TXSF
bits)
Data (3)
Data (1)
Summary of Contents for mPD703128
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