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| 型號： | 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)： | 74/112頁 |
| 文件大小： | 1496K |
| 代理商： | QSMRM |
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MOTOROLA
5-18
SCI SUBMODULE
QSM
REFERENCE MANUAL
Figure 5-5
shows that noise is perceived as the beginning of a start bit. Note that the
high level sensed at RT3 causes the internal working noise flag to be set. Even though
this figure shows improper alignment of the perceived bit-time boundaries to the actual
bit-time boundaries, the logic sense samples taken at RT8, RT9, and RT10 fall well
within the correct actual bit-time. The start bit and all other bits in the frame should be
received correctly.
Figure 5-5 Start Search Example 3
Figure 5-6
shows how a large burst of noise is perceived as the beginning of a start
bit. Note that RT5 is sensed logic high, setting the internal working noise flag. This fig-
ure also illustrates a worst-case alignment of the perceived bit-time boundaries to the
actual bit-time boundaries; however, RT8, RT9, and RT10 all fall within the correct ac-
tual bit-time. The start bit is detected and the incoming data stream is correctly sensed.
Figure 5-6 Start Search Example 4
Figure 5-7
illustrates the effect of noise early within the start bit-time. Although this
noise does not affect proper synchronization with the start bit-time, it does set the in-
ternal working noise flag.
PERCEIVED START BIT
LSB
R
T
1
R
1
R
T
1
R
T
2
R
T
3
R
T
4
R
T
5
R
T
5
R
T
1
R
T
1
R
T
1
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
5
R
T
1
6
R
T
1
R
T
2
R
T
4
R
T
6
R
T
7
1
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
1
1
1
0
1
0
0
0
R
T
3
Restart RT Clock
*
*
*
*
*
1
0
0
* *
^ ^ ^ ^ ^ ^
ACTUAL START BIT
R
T
1
1
LSB
R
T
1
R
T
2
R
T
3
R
T
4
R
T
5
R
T
6
R
T
7
R
T
7
R
T
1
R
T
1
R
T
1
R
T
8
R
T
9
R
T
1
0
R
T
1
2
R
T
1
3
R
T
1
4
R
T
1
5
R
T
1
6
R
T
1
R
T
2
R
T
3
R
T
4
R
T
6
R
T
8
R
T
9
1
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
1
1
0
0
1
0
0
0
R
T
5
Restart RT Clock
*
*
*
*
*
0
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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