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型號：	E5550F-DOW
廠商：	TEMIC SEMICONDUCTORS
元件分類：	通信及網絡
英文描述：	SPECIALTY TELECOM CIRCUIT, UUC7
封裝：	DIE-7
文件頁數(shù)：	750/1069頁
文件大?。?/td>	14303K
代理商：	E5550F-DOW

SAM4CP [DATASHEET]

43051E–ATPL–08/14

Figure 36-13. Asynchronous Start Bit Detection

The receiver is activated and starts Preamble and Frame Delimiter detection, sampling the data at one quarter and then

three quarters. If a valid preamble pattern or start frame delimiter is detected, the receiver continues decoding with the

same synchronization. If the stream does not match a valid pattern or a valid start frame delimiter, the receiver

resynchronizes on the next valid edge.The minimum time threshold to estimate the bit value is three quarters of a bit

If a valid preamble (if used) followed with a valid start frame delimiter is detected, the incoming stream is decoded into

NRZ data and passed to USART for processing.

Figure 36-14

illustrates Manchester pattern mismatch. When incoming

data stream is passed to the USART, the receiver is also able to detect Manchester code violation. A code violation is a

lack of transition in the middle of a bit cell. In this case, MANE flag in the US_CSR is raised. It is cleared by writing a 1 to

the RSTSTA in the US_CR. See

Figure 36-15

for an example of Manchester error detection during data phase.

Figure 36-14. Preamble Pattern Mismatch

Figure 36-15. Manchester Error Flag

When the start frame delimiter is a sync pattern (ONEBIT field to 0), both command and data delimiter are supported. If a

valid sync is detected, the received character is written as RXCHR field in the US_RHR and the RXSYNH is updated.

RXCHR is set to 1 when the received character is a command, and it is set to 0 if the received character is a data. This

mechanism alleviates and simplifies the direct memory access as the character contains its own sync field in the same

As the decoder is setup to be used in unipolar mode, the first bit of the frame has to be a zero-to-one transition.

Preamble Length is set to 8

Preamble Mismatch

invalid pattern

Preamble Mismatch

Manchester coding error

Preamble Length

Elementary character bit time

Coding Error

sampling points

Preamble subpacket

and Start Frame Delimiter

were successfully

Entering USART character area

相關PDF資料	PDF描述
E5551A-DIT	SPECIALTY TELECOM CIRCUIT, UUC7
E5551A-DOW	SPECIALTY TELECOM CIRCUIT, UUC7
E5551A-FP008	SPECIALTY TELECOM CIRCUIT, PDSO8
E5551A-FP008	SPECIALTY TELECOM CIRCUIT, PDSO8
E5551A-DOW	SPECIALTY TELECOM CIRCUIT, UUC7

相關代理商/技術參數(shù)	參數(shù)描述
E5550F-S8	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DIT	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-DOW	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder
E5551A-FP008	制造商:未知廠家制造商全稱:未知廠家功能描述:TRANSPONDER\|CMOS\|SOP\|8PIN\|PLASTIC
E5552	制造商:未知廠家制造商全稱:未知廠家功能描述:Transponder

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