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The command protocol defines the content of the data (payload) bytes of I C protocol sent by the master, and the slave
The slave (HMC6343) shall provide the acknowledge bits between each data byte per the I C protocol. Response byte
HMC6343
Command Protocol
2
device (HMC6343). Note that angular outputs are in tenths of a degree (0-3600 heading, ±0-900 tilt).
After the master device sends the 7-bit slave address, the 1-bit Read/Write, and gets the 1-bit slave device acknowledge
bit returned; the next one to three sent data bytes are defined as the input command and argument bytes. To conserve
data traffic, all response data (Reads) will be context sensitive to the last command (Write) sent. All write commands shall
have the address byte least significant bit cleared (factory default 0x32). These commands then follow with the command
byte and command specific binary formatted argument bytes in the general form of:
(Command Byte) (Argument Binary MS Byte) (Argument Binary LS Byte)
2
reads are done by sending the address byte (factory default 0x33) with the least significant bit set, and then clocking back
response bytes, last command dependant. Table 2 shows the HMC6343 command and response data flow.
Table 2 – HMC6343 Interface Commands/Responses
Command
Byte
(hex)
(0x40)
(0x45)
(0x50)
(0x55)
(0x65)
Argument 1 Byte
(Binary)
Argument 2 Byte
(Binary)
Response Bytes
(Binary)
MSB/LSB Data
(6 Bytes)
MSB/LSB Data
(6 Bytes)
MSB/LSB Data
(6 Bytes)
MSB/LSB Data
(6 Bytes)
Post OP Mode 1
Command Description
Post Accel Data. AxMSB, AxLSB,
AyMSB, AyLSB, AzMSB, AzLSB
Post Mag Data. MxMSB, MxLSB,
MyMSB, MyLSB, MzMSB, MzLSB
Post Heading Data. HeadMSB,
HeadLSB, PitchMSB, PitchLSB,
RollMSB, RollLSB
Post Tilt Data. PitchMSB, PitchLSB,
RollMSB, RollLSB, TempMSB,
TempLSB
Read the current value of OP Mode 1
(0x71)
(0x72)
(0x73)
(0x74)
(0x75)
(0x76)
(0x7E)
(0x82)
(0x83)
(0x84)
Enter User Calibration Mode
Level Orientation (X=forward, +Z=up)
(default)
Upright Sideways Orientation
(X=forward, Y=up)
Upright Flat Front Orientation
(Z=forward, -X=up)
Enter Run Mode (from Standby Mode)
Enter Standby Mode (from Run Mode)
Exit User Calibration Mode
Reset the Processor
Enter Sleep Mode (from Run Mode)
Exit Sleep Mode (to Standby Mode)
10
(0xE1)
(0xF1)
EEPROM Address
EEPROM Address
Data
Data (1 Byte)
Read from EEPROM
Write to EEPROM
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