參數(shù)資料
    

    


    


    
型號(hào)：
MR80C32-25SBR

    

    
廠商：
TEMIC SEMICONDUCTORS

    

    
元件分類：
微控制器/微處理器

    

    
英文描述：
8-BIT, 25 MHz, MICROCONTROLLER, CQCC44

    

    
文件頁(yè)數(shù)：
4/80頁(yè)

    

    
文件大?。?/td>
5152K

    

    
代理商：
MR80C32-25SBR


    

    

    

	
    
    
    

    
    
	
    196
    2466T–AVR–07/10
    ATmega16(L)
    The upper seven bits are the address to which the Two-wire Serial Interface will respond when
    addressed by a Master. If the LSB is set, the TWI will respond to the general call address ($00),
    otherwise it will ignore the general call address.
    TWEN must be written to one to enable the TWI. The TWEA bit must be written to one to enable
    the acknowledgement of the device’s own Slave address or the general call address. TWSTA
    and TWSTO must be written to zero.
    When TWAR and TWCR have been initialized, the TWI waits until it is addressed by its own
    Slave address (or the general call address if enabled) followed by the data direction bit. If the
    direction bit is “1” (read), the TWI will operate in ST mode, otherwise SR mode is entered. After
    its own Slave address and the write bit have been received, the TWINT Flag is set and a valid
    status code can be read from TWSR. The status code is used to determine the appropriate soft-
    ware action. The appropriate action to be taken for each status code is detailed in Table 77. The
    Slave Transmitter mode may also be entered if arbitration is lost while the TWI is in the Master
    mode (see state $B0).
    If the TWEA bit is written to zero during a transfer, the TWI will transmit the last byte of the trans-
    fer. State $C0 or state $C8 will be entered, depending on whether the Master Receiver transmits
    a NACK or ACK after the final byte. The TWI is switched to the not addressed Slave mode, and
    will ignore the Master if it continues the transfer. Thus the Master Receiver receives all “1” as
    serial data. State $C8 is entered if the Master demands additional data bytes (by transmitting
    ACK), even though the Slave has transmitted the last byte (TWEA zero and expecting NACK
    from the Master).
    While TWEA is zero, the TWI does not respond to its own Slave address. However, the Two-
    wire Serial Bus is still monitored and address recognition may resume at any time by setting
    TWEA. This implies that the TWEA bit may be used to temporarily isolate the TWI from the Two-
    wire Serial Bus.
    In all sleep modes other than Idle mode, the clock system to the TWI is turned off. If the TWEA
    bit is set, the interface can still acknowledge its own Slave address or the general call address
    by using the Two-wire Serial Bus clock as a clock source. The part will then wake up from sleep
    and the TWI will hold the SCL clock will low during the wake up and until the TWINT Flag is
    cleared (by writing it to one). Further data transmission will be carried out as normal, with the
    AVR clocks running as normal. Observe that if the AVR is set up with a long start-up time, the
    SCL line may be held low for a long time, blocking other data transmissions.
    Note that the Two-wire Serial Interface Data Register – TWDR does not reflect the last byte
    present on the bus when waking up from these sleep modes.
    TWCR
    TWINT
    TWEA
    TWSTA
    TWSTO
    TWWC
    TWEN
    –
    TWIE
    Value
    0
    100
    01
    0
    X
    
    
    
    
    
    


    


    

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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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MR80C86
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MR80C86/B
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