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型號：	MQ80C52CXXX-12/883:R
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44
文件頁數(shù)：	299/849頁
文件大?。?/td>	12530K

32099I–01/2012

AT32UC3L016/32/64

Synchronous and Asynchronous Modes

Transmitter Operations

The transmitter performs equally in both synchronous and asynchronous operating modes

(MR.SYNC). One start bit, up to 9 data bits, an optional parity bit, and up to two stop bits are

successively shifted out on the TXD pin at each falling edge of the serial clock. The number of

data bits is selected by the Character Length field (MR.CHRL) and the MR.MODE9 bit. Nine bits

are selected by writing a one to MODE9, overriding any value in CHRL. The parity bit configura-

tion is selected in the MR.PAR field. The Most Significant Bit First bit (MR.MSBF) selects which

data bit to send first. The number of stop bits is selected by the MR.NBSTOP field. The 1.5 stop

bit configuration is only supported in asynchronous mode.

Figure 19-4. Character Transmit

The characters are sent by writing to the Character to be Transmitted field (THR.TXCHR). The

transmitter reports status with the Transmitter Ready (TXRDY) and Transmitter Empty

(TXEMPTY) bits in the Channel Status Register (CSR). TXRDY is set when THR is empty.

TXEMPTY is set when both THR and the transmit shift register are empty (transmission com-

plete). Both TXRDY and TXEMPTY are cleared when the transmitter is disabled. Writing a

character to THR while TXRDY is zero has no effect and the written character will be lost.

Figure 19-5. Transmitter Status

Asynchronous Receiver

If the USART is configured in an asynchronous operating mode (MR.SYNC = 0), the receiver will

oversample the RXD input line by either 8 or 16 times the baud rate clock, as selected by the

Oversampling Mode bit (MR.OVER). If the line is zero for half a bit period (four or eight consecu-

tive samples, respectively), a start bit will be assumed, and the following 8th or 16th sample will

determine the logical value on the line, in effect resulting in bit values being determined at the

middle of the bit period.

Example: 8-bit, Parity Enabled One Stop

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MQ82370-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
MQ8238020	制造商:Intel 功能描述:CONTROLLER: OTHER
MQ82380-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
MQ82380-20/R	制造商:Rochester Electronics LLC 功能描述:
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