參數資料
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: 53/114頁
文件大?。?/td> 4047K
代理商: MC68HC05CJ4FB
GENERAL RELEASE SPECIFICATION
SERIAL COMMUNICATIONS INTERFACE
MC68HC(7)05CJ4
8-6
Rev. 2.1
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The following figures demonstrate the operation of the start bit search and
synchronization procedure. The logic sense sampling at RT8, RT9, and RT10
assumes that the probability of noise affecting three consecutive RT samples is
acceptably low, so the examples will not consider any such cases.
Example 1 shows the ideal case with no noise present.
Figure 8-1. Start Search Example 1
Example 2 shows the start bit search and resynchronization process being
restarted because the first low detected was determined to e noise rather than
being the beginning of a start bit time. Since the noise was before the start bit was
found, it would not cause the working noise flag to be set.
Figure 8-2. Start Search Example 2
*RT1
RT1
RT2
RT3
RT4
RT5
RT6
RT7
RT8
RT9
RT10
RT11
RT12
RT13
RT14
RT15
RT16
*RT1
RT2
RT3
11
1
10
0
PERCEIVED START BIT
ACTUAL START BIT
LSB
* = RESTART RT CLOCK
*RT1
*RT2
*RT3
*RT4
*RT5
*RT1
RT1
RT2
RT3
RT4
RT5
RT6
RT7
RT8
RT9
RT10
RT11
RT12
RT13
RT14
RT15
RT16
*RT1
RT2
RT3
11
1
0
1
10
0
PERCEIVED START BIT
ACTUAL START BIT
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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