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型號(hào)：	MD83C154TXXX-16P883D
廠商：	TEMIC SEMICONDUCTORS
元件分類(lèi)：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40
文件頁(yè)數(shù)：	63/839頁(yè)
文件大小：	61013K
代理商：	MD83C154TXXX-16P883D

ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]

8285E–AVR–02/2013

Synchronous Clock Operation

When synchronous mode is used (UMSELn = 1), the XCK pin will be used as either clock input (Slave) or clock

output (Master). The dependency between the clock edges and data sampling or data change is the same. The

basic principle is that data input (on RxD) is sampled at the opposite XCK clock edge of the edge the data output

(TxD) is changed.

Figure 20-3. Synchronous mode XCK timing.

The UCPOLn bit UCRSC selects which XCK clock edge is used for data sampling and which is used for data

change. As Figure 20-3 shows, when UCPOLn is zero the data will be changed at rising XCK edge and sampled at

falling XCK edge. If UCPOLn is set, the data will be changed at falling XCK edge and sampled at rising XCK edge.

Frame Formats

A serial frame is defined to be one character of data bits with synchronization bits (start and stop bits), and option-

ally a parity bit for error checking. The USART accepts all 30 combinations of the following as valid frame formats:

5, 6, 7, 8 or 9 data bits

No, even or odd parity bit

1 or 2 stop bits

A frame starts with the start bit followed by the least significant data bit. Then the next data bits, up to a total of

nine, are succeeding, ending with the most significant bit. If enabled, the parity bit is inserted after the data bits,

before the stop bits. When a complete frame is transmitted, it can be directly followed by a new frame, or the com-

munication line can be set to an idle (high) state. Figure 20-4 on page 155 illustrates the possible combinations of

the frame formats. Bits inside brackets are optional.

Figure 20-4. Frame formats.

Start bit, always low

Data bits (0 to 8)

Parity bit. Can be odd or even

Stop bit, always high

No transfers on the communication line (RxD or TxD). An IDLE line must be high

相關(guān)PDF資料	PDF描述
MR83C154XXX-16P883D	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQCC44
MR80C154-20/883	8-BIT, 20 MHz, MICROCONTROLLER, CQCC44
MQ83C154XXX-25/883R	8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44
MD80C52XXX-12SC	8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40
MR80C52EXXX-12SB	8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQCC44

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MD8412B	制造商:未知廠家制造商全稱:未知廠家功能描述:LINK(IEEE 1394)
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MD845A-R2	制造商:Black Box Corporation 功能描述:MODEM 202
MD845A-R2-W1	制造商:Black Box Corporation 功能描述:1 YEAR WARRANTY FOR MD845A-R2
MD845A-R2-W3	制造商:Black Box Corporation 功能描述:3 YEAR WARRANTY FOR MD845A-R2

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