- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄25626 > MD83C154CXXX-25/883 (ATMEL CORP) 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40 PDF資料下載
參數(shù)資料
| 型號(hào)： | MD83C154CXXX-25/883 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | 0.600 INCH, CERAMIC, DIP-40 |
| 文件頁數(shù)： | 61/298頁 |
| 文件大小： | 8529K |
| 代理商： | MD83C154CXXX-25/883 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁當(dāng)前第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁第223頁第224頁第225頁第226頁第227頁第228頁第229頁第230頁第231頁第232頁第233頁第234頁第235頁第236頁第237頁第238頁第239頁第240頁第241頁第242頁第243頁第244頁第245頁第246頁第247頁第248頁第249頁第250頁第251頁第252頁第253頁第254頁第255頁第256頁第257頁第258頁第259頁第260頁第261頁第262頁第263頁第264頁第265頁第266頁第267頁第268頁第269頁第270頁第271頁第272頁第273頁第274頁第275頁第276頁第277頁第278頁第279頁第280頁第281頁第282頁第283頁第284頁第285頁第286頁第287頁第288頁第289頁第290頁第291頁第292頁第293頁第294頁第295頁第296頁第297頁第298頁
153
ATmega8A [DATASHEET]
8159E–AVR–02/2013
sponding to the SCL and SDA pins, as explained in the I/O Port section. The internal pull-ups can in some systems
eliminate the need for external ones.
21.2.2
Bit Rate Generator Unit
This unit controls the period of SCL when operating in a Master mode. The SCL period is controlled by settings in
the TWI Bit Rate Register (TWBR) and the Prescaler bits in the TWI Status Register (TWSR). Slave operation
does not depend on Bit Rate or Prescaler settings, but the CPU clock frequency in the Slave must be at least 16
times higher than the SCL frequency. Note that slaves may prolong the SCL low period, thereby reducing the aver-
age TWI bus clock period. The SCL frequency is generated according to the following equation:
TWBR = Value of the TWI Bit Rate Register.
TWPS = Value of the prescaler bits in the TWI Status Register.
Note:
Pull-up resistor values should be selected according to the SCL frequency and the capacitive bus line load. See Table
26-4 on page 229 for value of pull-up resistor."
21.2.3
Bus Interface Unit
This unit contains the Data and Address Shift Register (TWDR), a START/STOP Controller and Arbitration detec-
tion hardware. The TWDR contains the address or data bytes to be transmitted, or the address or data bytes
received. In addition to the 8-bit TWDR, the Bus Interface Unit also contains a register containing the (N)ACK bit to
be transmitted or received. This (N)ACK Register is not directly accessible by the application software. However,
when receiving, it can be set or cleared by manipulating the TWI Control Register (TWCR). When in Transmitter
mode, the value of the received (N)ACK bit can be determined by the value in the TWSR.
The START/STOP Controller is responsible for generation and detection of START, REPEATED START, and
STOP conditions. The START/STOP controller is able to detect START and STOP conditions even when the AVR
MCU is in one of the sleep modes, enabling the MCU to wake up if addressed by a Master.
If the TWI has initiated a transmission as Master, the Arbitration Detection hardware continuously monitors the
transmission trying to determine if arbitration is in process. If the TWI has lost an arbitration, the Control Unit is
informed. Correct action can then be taken and appropriate status codes generated.
21.2.4
Address Match Unit
The Address Match unit checks if received address bytes match the seven-bit address in the TWI Address Regis-
ter (TWAR). If the TWI General Call Recognition Enable (TWGCE) bit in the TWAR is written to one, all incoming
address bits will also be compared against the General Call address. Upon an address match, the Control Unit is
informed, allowing correct action to be taken. The TWI may or may not acknowledge its address, depending on set-
tings in the TWCR. The Address Match unit is able to compare addresses even when the AVR MCU is in sleep
mode, enabling the MCU to wake up if addressed by a Master. If another interrupt (e.g., INT0) occurs during TWI
Power-down address match and wakes up the CPU, the TWI aborts operation and return to it’s idle state. If this
cause any problems, ensure that TWI Address Match is the only enabled interrupt when entering Power-down.
21.2.5
Control Unit
The Control unit monitors the TWI bus and generates responses corresponding to settings in the TWI Control Reg-
ister (TWCR). When an event requiring the attention of the application occurs on the TWI bus, the TWI Interrupt
Flag (TWINT) is asserted. In the next clock cycle, the TWI Status Register (TWSR) is updated with a status code
identifying the event. The TWSR only contains relevant status information when the TWI Interrupt Flag is asserted.
At all other times, the TWSR contains a special status code indicating that no relevant status information is avail-
able. As long as the TWINT Flag is set, the SCL line is held low. This allows the application software to complete its
tasks before allowing the TWI transmission to continue.
SCL frequency
CPU Clock frequency
16
2(TWBR) 4
TWPS
+
-----------------------------------------------------------
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MD80C52CXXX-12SCD | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CDIP40 |
| MF180C51C-25D | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP44 |
| MF280C51C-36R | 8-BIT, MROM, 36 MHz, MICROCONTROLLER, PQFP44 |
| MQ80C52TXXX-16SC | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 |
| MQ80C52XXX-16P883D | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MD83C154-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 |
| MD83C154T-12 | 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 |
| MD83C154T-16 | 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 |
| MD83C154T-20 | 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 |
| MD83C154T-25 | 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。