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型號(hào)：	E5550F-DOW
廠商：	ATMEL CORP
元件分類：	通信及網(wǎng)絡(luò)
英文描述：	SPECIALTY TELECOM CIRCUIT, UUC7
封裝：	DIE-7
文件頁(yè)數(shù)：	818/1069頁(yè)
文件大小：	14303K
代理商：	E5550F-DOW

SAM4CP [DATASHEET]

43051E–ATPL–08/14

37.6.14.3 Direction Status and Change Detection

After filtering, the quadrature signals are analyzed to extract the rotation direction and edges of the two quadrature

signals detected in order to be counted by timer/counter logic downstream.

The direction status can be directly read at anytime in the TC_QISR. The polarity of the direction flag status depends on

the configuration written in TC_BMR. INVA, INVB, INVIDX, SWAP modify the polarity of DIR flag.

Any change in rotation direction is reported in the TC_QISR and can generate an interrupt.

The direction change condition is reported as soon as two consecutive edges on a phase signal have sampled the same

value on the other phase signal and there is an edge on the other signal. The two consecutive edges of one phase signal

sampling the same value on other phase signal is not sufficient to declare a direction change, for the reason that

particulate contamination may mask one or more reflective bars on the optical or magnetic disk of the sensor. (Refer to

Figure 37-18 ”Rotation Change Detection”

for waveforms.)

Figure 37-18. Rotation Change Detection

The direction change detection is disabled when QDTRANS is set in the TC_BMR. In this case the DIR flag report must

not be used.

A quadrature error is also reported by the quadrature decoder logic via the QERR flag in the TC_QISR. This error is

reported if the time difference between two edges on PHA, PHB is lower than a predefined value. This predefined value

is configurable and corresponds to (MAXFILT+1) * t

peripheral clock

ns. After being filtered there is no reason to have two

edges closer than (MAXFILT+1) * t

peripheral clock

ns under normal mode of operation.

Direction Change under normal conditions

change condition

No direction change due to particulate contamination masking a reflective bar

spurious change condition (if detected in a simple way)

missing pulse

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相關(guān)代理商/技術(shù)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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