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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)：	754/1069頁(yè)
文件大?。?/td>	14303K
代理商：	E5550F-DOW

SAM4CP [DATASHEET]

43051E–ATPL–08/14

Figure 36-21. Parity Error

36.6.3.9 Multidrop Mode

If the value 0x6 or 0x07 is written to the PAR field in the US_MR, the USART runs in Multidrop Mode. This mode

differentiates the data characters and the address characters. Data is transmitted with the parity bit at 0 and addresses

are transmitted with the parity bit at 1.

If the USART is configured in multidrop mode, the receiver sets the PARE parity error bit when the parity bit is high and

the transmitter is able to send a character with the parity bit high when a one is written to the SENDA bit in the US_CR.

To handle parity error, the PARE bit is cleared when a one is written to the RSTSTA bit in the US_CR.

The transmitter sends an address byte (parity bit set) when SENDA is written to in the US_CR. In this case, the next byte

written to the US_THR is transmitted as an address. Any character written in the US_THR without having written the

command SENDA is transmitted normally with the parity at 0.

36.6.3.10 Transmitter Timeguard

The timeguard feature enables the USART interface with slow remote devices.

The timeguard function enables the transmitter to insert an idle state on the TXD line between two characters. This idle

state actually acts as a long stop bit.

The duration of the idle state is programmed in the TG field of the Transmitter Timeguard Register (US_TTGR). When

this field is written to zero no timeguard is generated. Otherwise, the transmitter holds a high level on TXD after each

transmitted byte during the number of bit periods programmed in TG in addition to the number of stop bits.

As illustrated in

Figure 36-22

, the behavior of TXRDY and TXEMPTY status bits is modified by the programming of a

timeguard. TXRDY rises only when the start bit of the next character is sent, and thus remains to 0 during the timeguard

transmission if a character has been written in US_THR. TXEMPTY remains low until the timeguard transmission is

completed as the timeguard is part of the current character being transmitted.

Figure 36-22. Timeguard Operations

Parity Error

相關(guān)PDF資料	PDF描述
E5530H-230-S8	SPECIALTY TELECOM CIRCUIT, PDSO8
E5530H-230-DOW	SPECIALTY TELECOM CIRCUIT, UUC
ECM2A5C3A12-29.939MTR	QUARTZ CRYSTAL RESONATOR, 29.939 MHz
ECM2A5C3A32-34.400M	QUARTZ CRYSTAL RESONATOR, 34.4 MHz
ED1702N	NPN general purpose transistor

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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