HMC5983-DEM Datasheet, PDF (17/28 Pages) Honeywell Accelerometers – 3-Axis Digital Compass IC

HMC5983
Mode Register
The mode register is an 8-bit register from which data can be read or to which data can be written. This register is used to
select the operating mode of the device. MR0 through MR7 indicate bit locations, with MR denoting the bits that are in the
mode register. MR7 denotes the first bit of the data stream. The number in parenthesis indicates the default value of that
bit. Mode register default is 0x01.
Table 10: Mode Register
MR7 MR6
(0) (0)
MR5
(0)
MR4
(0)
MR3
(0)
MR2
(0)
MR1
MR0
MD1 (0) MD0 (1)
Table 11: Mode Register Bit Designations
Location Name
MR7
HS
Description
Set this pin to enable I²C High Speed mode, 3400 kHz.
MR6
N/A
MR5
LP
MR4
N/A
Clear this bit for correct operation.
Lowest power mode. When set, ODR=0.75 Hz, and
Averaging = 1.
This bit has no functionality.
MR3
MR2
MR1 to
MR0
N/A
SIM
MD1 to
MD0
Clear this bit for correct operation.
SPI serial interface mode selection:
0: 4-wire SPI interface
1: 3-wire SPI interface
Mode Select Bits. These bits select the operation mode of
this device.
Table 12: Operating Modes
MD1
0
0
1
MD0
0
1
0
Operating Mode
Continuous-Measurement Mode. In continuous-measurement mode,
the device continuously performs measurements and places the
result in the data register. RDY goes high when new data is placed
in all three registers. After a power-on or a write to the mode or
configuration register, the first measurement set is available from all
three data output registers after a period of 2/f_DO and subsequent
measurements are available at a frequency of f_DO, where f_DO is the
frequency of data output.
Single-Measurement Mode (Default). When single-measurement
mode is selected, device performs a single measurement, sets RDY
high and returned to idle mode. Mode register returns to idle mode
bit values. The measurement remains in the data output register and
RDY remains high until the data output register is read or another
measurement is performed.
Idle Mode. Device is placed in idle mode.
1
1
Idle Mode. Device is placed in idle mode.
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