參數(shù)資料
型號: MC68HC05CJ4FB
廠商: FREESCALE SEMICONDUCTOR 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: PLASTIC, QFP-44
文件頁數(shù): 54/114頁
文件大?。?/td> 4047K
代理商: MC68HC05CJ4FB
GENERAL RELEASE SPECIFICATION
SERIAL COMMUNICATIONS INTERFACE
Rev. 2.1
8-7
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In example 3, noise is perceived as the beginning of a start bit although the test
sample at RT3 was high setting the working noise flag. Even though this shows
improper alignment of perceived bit time boundaries to actual bit time boundaries
the logic sense samples taken at RT8, RT9, and RT10 will fall well within the
correct actual bit time and data recovery should still be good.
Figure 8-3. Start Search Example 3
In example 4, a large burst of noise is perceived as the beginning of a start bit,
although the test sample at RT5 was high, setting the working noise flag. Even
though this shows a worst case alignment of perceived bit time boundaries to
actual bit time boundaries, the logic sense samples taken at RT8, RT9, and RT10
will fall within the correct actual bit time, and data recovery should still be
successful.
Figure 8-4. Start Search Example 4
*RT1
RT2
RT3
RT4
RT5
RT6
RT7
RT8
RT9
RT10
RT11
RT12
RT13
RT14
RT15
RT16
*RT1
RT2
RT3
RT4
RT5
RT6
RT7
11
1
00
0
ACTUAL START BIT
LSB
* = RESTART RT CLOCK
:
PERCEIVED START BIT
ACTUAL START BIT
PERCEIVED START BIT
*RT1
RT2
RT3
RT4
RT5
RT6
RT7
RT8
RT9
RT10
RT11
RT12
RT13
RT14
RT15
RT16
*RT1
RT2
RT3
RT4
RT5
RT6
RT7
RT8
RT9
11
1
0
1
00
0
LSB
* = RESTART RT CLOCK
:
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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