參數(shù)資料
型號(hào): 82803AAMRH-R
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁(yè)數(shù): 38/52頁(yè)
文件大?。?/td> 322K
代理商: 82803AAMRH-R
82803AA MRH-R
R
Datasheet
38
4.1.4.3.
Command Protocol and Bus Timing
SMBUS Start and Stop protocol
The following diagram illustrates the start and stop protocol of SMBUS.
Figure 19. SMBUS Start and Stop Conditions
smbus_start_stop
START
STOP
START = High to low transition of SMBDATA while SMBCLK is high
STOP = Low to High transition of SMBDATA while SMBCLK is high
Read Byte
Reading data is accomplished by the MRH-R first writing the byte address to the EEPROM. The MRH-R
then follows that write command with a repeated start condition to denote a read from that device's
address. The EEPROM then returns 1 bytes of data.
Table 3. Read Byte Protocol
Bit
Description
1
Start
2-8
Slave (EEPROM) Address - 7 bits
9
Write
10
Acknowledge from slave (EEPROM)
11-18
Byte Address - 8 bits
19
Acknowledge from slave (EEPROM)
20
Repeated Start
21-27
Slave (EEPROM) Address - 7 bits
28
Read
29
Acknowledge from slave (EEPROM)
30-37
Data from slave (EEPROM) - 8 bits
38
NOT acknowledge
39
Stop
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