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參數資料
型號: MC68HC05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 78/160頁
文件大小: 783K
代理商: MC68HC05C9A
L
G
R
Serial Communications Interface (SCI)
General Release Specification
MC68HC05C9A
Rev. 4.0
78
Serial Communications Interface (SCI)
MOTOROLA
9.12 Start Bit Detection
When the input (idle) line is detected low, it is tested for three more
sample times (referred to as the start edge verification samples in
Figure 9-4
). If at least two of these three verification samples detect a
logic zero, a valid start bit has been detected; otherwise, the line is
assumed to be idle. A noise flag is set if all three verification samples do
not detect a logic zero. Thus, a valid start bit could be assumed with a
set noise flag present.
If a framing error has occurred without detection of a break (10 zeros for
8-bit format or 11 zeros for 9-bit format), the circuit continues to operate
as if there actually was a stop bit, and the start edge will be placed
artificially. The last bit received in the data shift register is inverted to a
logic one, and the three logic one start qualifiers (shown in
Figure 9-4
)
are forced into the sample shift register during the interval when
detection of a start bit is anticipated (see
Figure 9-6
); therefore, the start
bit will be accepted no sooner than it is anticipated.
If the receiver detects that a break (RDRF = 1, FE = 1, receiver data
register = $003B) produced the framing error, the start bit will not be
artificially induced and the receiver must actually detect a logic one
before the start bit can be recognized (see
Figure 9-7
).
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相關代理商/技術參數
參數描述
MC68HC05C9AB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AFB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AFN 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AMB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AMFB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
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