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型號(hào)：	MQ80C32-20
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 20 MHz, MICROCONTROLLER, CQFP44
封裝：	CERAMIC, QFP-44
文件頁(yè)數(shù)：	699/1185頁(yè)
文件大?。?/td>	5451K
代理商：	MQ80C32-20

SAM9G45 [DATASHEET]

6438K–ATARM–12-Feb-13

If the oversampling is 16, (OVER at 0), a start is detected at the eighth sample at 0. Then, data bits, parity bit and

stop bit are sampled on each 16 sampling clock cycle. If the oversampling is 8 (OVER at 1), a start bit is detected

at the fourth sample at 0. Then, data bits, parity bit and stop bit are sampled on each 8 sampling clock cycle.

The number of data bits, first bit sent and parity mode are selected by the same fields and bits as the transmitter,

i.e. respectively CHRL, MODE9, MSBF and PAR. For the synchronization mechanism only, the number of stop

bits has no effect on the receiver as it considers only one stop bit, regardless of the field NBSTOP, so that resyn-

chronization between the receiver and the transmitter can occur. Moreover, as soon as the stop bit is sampled, the

receiver starts looking for a new start bit so that resynchronization can also be accomplished when the transmitter

is operating with one stop bit.

Figure 33-12 and Figure 33-13 illustrate start detection and character reception when USART operates in asyn-

chronous mode.

Figure 33-12. Asynchronous Start Detection

Figure 33-13. Asynchronous Character Reception

Manchester Decoder

When the MAN field in US_MR register is set to 1, the Manchester decoder is enabled. The decoder performs both

preamble and start frame delimiter detection. One input line is dedicated to Manchester encoded input data.

An optional preamble sequence can be defined, its length is user-defined and totally independent of the emitter

side. Use RX_PL in US_MAN register to configure the length of the preamble sequence. If the length is set to 0, no

preamble is detected and the function is disabled. In addition, the polarity of the input stream is programmable with

10111213141516

Example: 8-bit, Parity Enabled

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
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MQ82380-20/R	制造商:Rochester Electronics LLC 功能描述:
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