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型號(hào)：	E5550F-DOW
廠商：	TEMIC SEMICONDUCTORS
元件分類：	通信及網(wǎng)絡(luò)
英文描述：	SPECIALTY TELECOM CIRCUIT, UUC7
封裝：	DIE-7
文件頁數(shù)：	755/1069頁
文件大?。?/td>	14303K
代理商：	E5550F-DOW

SAM4CP [DATASHEET]

43051E–ATPL–08/14

indicates the maximum length of a timeguard period that the transmitter can handle in relation to the function

of the baud rate.

36.6.3.11 Receiver Time-out

The Receiver Time-out provides support in handling variable-length frames. This feature detects an idle condition on the

RXD line. When a time-out is detected, the bit TIMEOUT in the US_CSR rises and can generate an interrupt, thus

indicating to the driver an end of frame.

The time-out delay period (during which the receiver waits for a new character) is programmed in the TO field of the

Receiver Time-out Register (US_RTOR). If the TO field is written to 0, the Receiver Time-out is disabled and no time-out

is detected. The TIMEOUT bit in the US_CSR remains at 0. Otherwise, the receiver loads a 16-bit counter with the value

programmed in TO. This counter is decremented at each bit period and reloaded each time a new character is received.

If the counter reaches 0, the TIMEOUT bit in US_CSR rises. Then, the user can either:

Stop the counter clock until a new character is received. This is performed by writing a one to the STTTO (Start

Time-out) bit in the US_CR. In this case, the idle state on RXD before a new character is received will not provide

a time-out. This prevents having to handle an interrupt before a character is received and allows waiting for the

next idle state on RXD after a frame is received.

Obtain an interrupt while no character is received. This is performed by writing a one to the RETTO (Reload and

Start Time-out) bit in the US_CR. If RETTO is performed, the counter starts counting down immediately from the

value TO. This enables generation of a periodic interrupt so that a user time-out can be handled, for example when

no key is pressed on a keyboard.

If STTTO is performed, the counter clock is stopped until a first character is received. The idle state on RXD before the

start of the frame does not provide a time-out. This prevents having to obtain a periodic interrupt and enables a wait of

the end of frame when the idle state on RXD is detected.

If RETTO is performed, the counter starts counting down immediately from the value TO. This enables generation of a

periodic interrupt so that a user time-out can be handled, for example when no key is pressed on a keyboard.

Figure 36-23

shows the block diagram of the Receiver Time-out feature.

Maximum Timeguard Length Depending on Baud Rate

Baud Rate (Bit/s)

Timeguard (ms)

相關(guān)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(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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