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| 型號(hào)： | QSMRM |
| 英文描述： | QSMRM QSM Queued Serial Module Reference Manual |
| 中文描述： | QSMRM QSM排隊(duì)串行模塊參考手冊 |
| 文件頁數(shù)： | 73/112頁 |
| 文件大?。?/td> | 1496K |
| 代理商： | QSMRM |
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QSM
REFERENCE MANUAL
SCI SUBMODULE
MOTOROLA
5-17
If RT8, RT9, and RT10 do not all agree, an internal working noise flag is set. Addition-
ally for the start bit, if RT3, RT5, and RT7 do not all agree, the internal working noise
flag is set. If this flag is set for any of the bit-times in a frame, the NF flag in SCSR is
set concurrently with the RDRF flag in SCSR when the data is transferred to register
RDR. The user must determine if the data received with NF set is valid. Noise on the
RXD pin does not necessarily corrupt all data.
The operation of the receiver bit processor is shown in the following figures. These ex-
amples demonstrate the search for a valid start bit and the synchronization procedure
as outlined above. The possibility of noise durations greater than one bit-time are not
considered in these examples.
Figure 5-3
illustrates the ideal case with no noise
present.
Figure 5-3 Start Search Example 1
Figure 5-4
shows the start bit search and resynchronization process being restarted
because the first low detected was determined to be noise rather than the beginning
of a start bit-time. Since the noise occurred before the start bit was found, it will not
cause the internal working noise flag to be set.
Figure 5-4 Start Search Example 2
PERCEIVED START BIT
LSB
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
T
1
R
T
2
R
T
3
R
T
4
R
T
5
R
T
6
R
T
7
R
T
8
R
T
9
R
T
1
0
R
T
1
1
R
T
1
2
R
T
1
3
R
T
1
4
R
T
1
6
R
T
2
R
T
3
1
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
*
*
*
*
*
*
*
*
*
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
R
T
1
5
Restart RT Clock
^ ^ ^ ^ ^ ^
*
ACTUAL START BIT
*
R
LSB
R
T
1
R
T
2
R
T
3
R
T
4
R
T
5
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
R
T
1
R
T
2
R
T
3
R
T
4
R
T
5
R
T
6
R
T
7
R
T
8
R
T
9
R
T
1
0
R
T
1
1
R
T
1
2
R
T
1
3
R
T
1
4
R
T
1
6
R
T
2
R
T
3
1
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
1
1
0
1
1
1
1
0
0
0
0
0
0
0
R
T
1
5
Restart RT Clock
*
*
*
*
*
*
*
PERCEIVED START BIT
ACTUAL START BIT
^ ^ ^ ^ ^ ^
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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