久久综合亚洲鲁鲁五月天精品v ,精品人妻在线,免费无毒永久av网站

您好，
買賣IC網(wǎng)歡迎您。
請(qǐng)登錄
免費(fèi)注冊(cè)

您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45320 > MQ80C154-30P883D (TEMIC SEMICONDUCTORS) 8-BIT, 30 MHz, MICROCONTROLLER, CQFP44 PDF資料下載

型號(hào)：	MQ80C154-30P883D
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 30 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)：	93/839頁(yè)
文件大小：	61013K
代理商：	MQ80C154-30P883D

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

8285E–AVR–02/2013

Referring to the timing diagram (Figure 21-5 on page 181), a bus transfer involves the following steps:

The a start condition is generated by the Master by forcing the SDA low line while the SCL line is high (A).

SDA can be forced low either by writing a zero to bit 7 of the Shift Register, or by setting the corresponding

bit in the PORT Register to zero. Note that the Data Direction Register bit must be set to one for the output

to be enabled. The slave device’s start detector logic (Figure 21-6 on page 182) detects the start condition

and sets the USISIF Flag. The flag can generate an interrupt if necessary.

In addition, the start detector will hold the SCL line low after the Master has forced an negative edge on this

line (B). This allows the Slave to wake up from sleep or complete its other tasks before setting up the Shift

The Master set the first bit to be transferred and releases the SCL line (C). The Slave samples the data and

shift it into the Serial Register at the positive edge of the SCL clock.

After eight bits are transferred containing slave address and data direction (read or write), the Slave counter

overflows and the SCL line is forced low (D). If the slave is not the one the Master has addressed, it

releases the SCL line and waits for a new start condition.

If the Slave is addressed it holds the SDA line low during the acknowledgment cycle before holding the SCL

line low again (i.e., the Counter Register must be set to 14 before releasing SCL at (D)). Depending of the

R/W bit the Master or Slave enables its output. If the bit is set, a master read operation is in progress (i.e.,

the slave drives the SDA line) The slave can hold the SCL line low after the acknowledge (E).

Multiple bytes can now be transmitted, all in same direction, until a stop condition is given by the Master (F).

Or a new start condition is given.

If the Slave is not able to receive more data it does not acknowledge the data byte it has last received. When the

Master does a read operation it must terminate the operation by force the acknowledge bit low after the last byte

transmitted.

Figure 21-6. Start Condition Detector, logic diagram.

Start Condition Detector

The start condition detector is shown in Figure 21-6. The SDA line is delayed (in the range of 50 to 300ns) to

ensure valid sampling of the SCL line. The start condition detector is only enabled in Two-wire mode.

The start condition detector is working asynchronously and can therefore wake up the processor from the Power-

down sleep mode. However, the protocol used might have restrictions on the SCL hold time. Therefore, when

using this feature in this case the Oscillator start-up time set by the CKSEL Fuses (see ”Clock systems and their

distribution” on page 27) must also be taken into the consideration. Refer to the USISIF bit description on page 184

for further details.

Clock speed considerations.

Maximum frequency for SCL and SCK is f_CK /4. This is also the maximum data transmit and receieve rate in both

two- and three-wire mode. In two-wire slave mode the Two-wire Clock Control Unit will hold the SCL low until the

slave is ready to receive more data. This may reduce the actual data rate in two-wire mode.

Alternative USI Usage

When the USI unit is not used for serial communication, it can be set up to do alternative tasks due to its flexible

Write( USISIF)

相關(guān)PDF資料	PDF描述
MR83C154XXX-12/883D	8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQCC44
MD80C154-L16/883	8-BIT, 16 MHz, MICROCONTROLLER, CDIP40
MQ83C154XXX-16/883	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
MR83C154XXX-20P883R	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
MR83C154XXX-25/883	8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MQ80C154-36	制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller
MQ80C154-L16	制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:CMOS 0 to 36 MHz Single Chip 8-bit Microcontroller
MQ80C186-10/BYA	制造商:Rochester Electronics LLC 功能描述:
MQ80C186-12/BYA	制造商:Rochester Electronics LLC 功能描述:
MQ80C186-12/BYC	制造商:Rochester Electronics LLC 功能描述:

發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

(若只采購(gòu)一條型號(hào)，填寫一行即可)

*型號(hào)	*數(shù)量	廠商	批號(hào)	封裝

采購(gòu)需求

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

我的聯(lián)系方式

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)