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| 型號： | QSMRM |
| 英文描述： | QSMRM QSM Queued Serial Module Reference Manual |
| 中文描述： | QSMRM QSM排隊串行模塊參考手冊 |
| 文件頁數(shù)： | 75/112頁 |
| 文件大?。?/td> | 1496K |
| 代理商： | QSMRM |
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QSM
REFERENCE MANUAL
SCI SUBMODULE
MOTOROLA
5-19
Figure 5-7 Start Search Example 5
Figure 5-8
shows a large burst of noise near the beginning of the start bit that causes
the start bit search to be restarted. During RT1 following RT7, a search for a new start
bit could not be started as the previous three RT samples are not all high. The receiver
bit processor misses this start bit. The frame might be partially received or missed en-
tirely, depending on the data in the frame and when the start bit search logic synchro-
nized upon what appeared to be a start bit. If a valid stop bit is not detected, an FE flag
is set in SCSR.
Figure 5-8 Start Search Example 6
Figure 5-9
explores the case where the majority vote of RT8, RT9, and RT10 returns
a logic-high level. However, the start bit is a special case that overrules the majority
voting scheme. In review, at least three of the samples taken at RT1, RT3, RT5, and
RT7 must be low. The start bit is detected and the RT clock is synchronized; because
RT8–RT10 were not unanimous, the NF flag is set.
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
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
1
1
1
1
1
1
0
1
0
0
0
0
0
R
T
1
5
Restart RT Clock
*
*
*
*
*
*
*
*
*
*
*
PERCEIVED START BIT
^ ^ ^ ^ ^ ^
ACTUAL START BIT
SEE EXPLANATION – NO START BIT FOUND
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
R
T
1
R
T
2
R
T
3
R
T
4
R
T
5
R
T
6
R
T
7
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
1
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
1
1
1
1
1
1
1
1
0
0
1
1
0
0
0
R
T
1
Restart RT Clock
*
ACTUAL START BIT
*
*
*
*
*
*
*
*
*
*
0
0
0
0
^ ^ ^ ^ ^ ^
0
0
0
*
*
*
*
*
*
*
*
*
*
*
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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