參數(shù)資料
型號: X4C105
元件分類: CPU監(jiān)測
英文描述: RTC Module With CPU Supervisor
中文描述: 時鐘模塊CPU監(jiān)控
文件頁數(shù): 4/18頁
文件大?。?/td> 93K
代理商: X4C105
X4C105
4
Serial Stop Condition
All communications must be terminated by a stop
condition, which is a LOW to HIGH transition of SDA when
SCL is HIGH. The stop condition is also used to place the
device into the Standby power mode after a read
sequence. A stop condition can only be issued after the
transmitting device has released the bus. See figure 3.
Serial Acknowledge
Acknowledge is a software convention used to indicate
successful data transfer. The transmitting device, either
master or slave, will release the bus after transmitting
eight bits. During the ninth clock cycle, the receiver will
pull the SDA line LOW to acknowledge that it received
the eight bits of data. Refer to figure 4.
The device will respond with an acknowledge after
recognition of a start condition and if the correct Device
Identifier and Select bits are contained in the Slave
Address Byte. If a write operation is selected, the device
will respond with an acknowledge after the receipt of
each subsequent eight bit word. The device will
acknowledge all incoming data and address bytes,
except for the Slave Address Byte when the Device
Identifier and/or Select bits are incorrect or when the
device is busy, such as during a nonvolatile write.
In the read mode, the device will transmit eight bits of
data, release the SDA line, then monitor the line for an
acknowledge. If an acknowledge is detected and no stop
condition is generated by the master, the device will
continue to transmit data. The device will terminate
further data transmissions if an acknowledge is not
detected. The master must then issue a stop condition to
return the device to Standby mode and place the device
into a known state.
SCL
SDA
Start
Stop
Figure 3. Valid Start and Stop Conditions
SCL from
Master
Data Output from
Transmitter
Data Output from
Receiver
8
1
9
Start
Acknowledge
Figure 4. Acknowledge Response From Receiver
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