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參數(shù)資料
| 型號： | MC68HC05CJ4FB |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數(shù)： | 55/114頁 |
| 文件大小： | 361K |
| 代理商： | MC68HC05CJ4FB |
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GENERAL RELEASE SPECIFICATION
MOTOROLA
SERIAL COMMUNICATIONS INTERFACE
MC68HC(7)05CJ4
8-8
Rev. 2.1
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Example 5 shows 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
working noise flag.
Figure 8-5. Start Search Example 5
In example 6, a large burst of noise near the beginning of the start bit caused the
start bit search to be restarted. During the RT period after the restart at RT7, a low
was sensed but the preceding three RT samples were not all high so no falling
edge could be recognized. Since the circuit cannot locate the start bit, the frame
will be received as a Framing Error, improperly received, or missed entirely
depending on the data in the frame and when the start bit search logic
synchronized on what it thought was a start bit. In the narrative prior to the
examples, it was stated that any burst of noise that could cause three consecutive
RT samples to sense the incorrect data level was so improbable that it would not
be considered. Example 6 shows two separate short duration noise incidents
which are so specifically positioned within the frame that this case could be ignored
on similar grounds of very low probability.
Figure 8-6. Start Search Example 6
*RT1
RT1
RT2
RT3
RT4
RT5
RT6
RT7
RT8
RT9
RT10
RT11
RT12
RT13
RT14
RT15
RT16
*RT1
RT2
RT3
11
1
10
1
0
PERCEIVED START BIT
ACTUAL START BIT
LSB
* = RESTART RT CLOCK
*RT1
RT1
RT2
RT3
RT4
RT5
RT6
RT7
*RT1
11
1
10
1
0
000
0
ACTUAL START BIT
LSB
* = RESTART RT CLOCK
10
0
000
0d
d
SEE EXPLANATION — NO START BIT FOUND
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05CT4FB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification |
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