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Table 11. Register Address Map
PULSE_WIND (3)(4)
R/W
0x28
0x29
00000000
0x00
Window time for 2nd pulse
ASLP_COUNT
(3)(4)
R/W
0x29
0x2A
00000000
0x00
Counter setting for Auto-SLEEP
CTRL_REG1 (3)(4)
CTRL_REG2 (3)(4)
CTRL_REG3 (3)(4)
CTRL_REG4 (3)(4)
CTRL_REG5 (3)(4)
OFF_X (3)(4)
OFF_Y (3)(4)
OFF_Z (3)(4)
Reserved (do not modify)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x40 – 7F
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x0D
—
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
—
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
—
Data Rate, ACTIVE Mode
Sleep Enable, OS Modes,
RST, ST
Wake from Sleep, IPOL, PP_OD
Interrupt enable register
Interrupt pin (INT1/INT2) map
X-axis offset adjust
Y-axis offset adjust
Z-axis offset adjust
Reserved. Read return 0x00.
1.
2.
3.
4.
Register contents are reset when transition from STANDBY to ACTIVE mode occurs.
This register data is only valid in ACTIVE mode.
Register contents are preserved when transition from ACTIVE to STANDBY mode occurs.
Modification of this register’s contents can only occur when device is STANDBY mode except CTRL_REG1 ACTIVE bit and CTRL_REG2
RST bit.
Note : Auto-increment addresses which are not a simple increment are highlighted in bold . The auto-increment addressing is only enabled when
device registers are read using I 2 C burst read mode. Therefore the internal storage of the auto-increment address is cleared whenever a
STOP condition is detected.
6.1
Data Registers
The following are the data registers for the MMA8452Q. For more information on data manipulation of the MMA8452Q, refer
to application note, AN4076 .
0x00: STATUS Data Status Register (Read Only)
Bit 7
ZYXOW
Bit 6
ZOW
Bit 5
YOW
Bit 4
XOW
Bit 3
ZYXDR
Bit 2
ZDR
Bit 1
YDR
Bit 0
XDR
Table 12. STATUS Description
X, Y, Z-axis Data Overwrite. Default value: 0
ZYXOW
ZOW
YOW
XOW
ZYXDR
ZDR
YDR
XDR
0: No data overwrite has occurred
1: Previous X, Y, or Z data was overwritten by new X, Y, or Z data before it was read
Z-axis Data Overwrite. Default value: 0
0: No data overwrite has occurred
1: Previous Z-axis data was overwritten by new Z-axis data before it was read
Y-axis Data Overwrite. Default value: 0
0: No data overwrite has occurred
1: Previous Y-axis data was overwritten by new Y-axis data before it was read
X-axis Data Overwrite. Default value: 0
0: No data overwrite has occurred
1: Previous X-axis data was overwritten by new X-axis data before it was read
X, Y, Z-axis new Data Ready. Default value: 0
0: No new set of data ready
1: A new set of data is ready
Z-axis new Data Available. Default value: 0
0: No new Z-axis data is ready
1: A new Z-axis data is ready
Y-axis new Data Available. Default value: 0
0: No new Y-axis data ready
1: A new Y-axis data is ready
X-axis new Data Available. Default value: 0
0: No new X-axis data ready
1: A new X-axis data is ready
MMA8452Q
Sensors
Freescale Semiconductor, Inc.
19
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