Sensors

Freescale Semiconductor

3

MMA8450Q

6

Register Descriptions ....................................................................................................................................................... 19

Table 11. Register Address Map ............................................................................................................................... 19

6.1

Data Registers ........................................................................................................................................................... 21

0x00, 0x04, 0x0B: STATUS Registers ......................................................................................................................... 21

Alias for DR_Status (0x0B) or F_Status (0x10) ................................................................................................... 21

0X00, 0X04, 0X0B STATUS: Data Status Registers (Read Only) ...................................................................... 21

Table 12. STATUS Description ................................................................................................................................. 21

0x01, 0x02, 0x03: OUT_MSB 8-Bit XYZ Data Registers ............................................................................................. 22

0x01 OUT_X_MSB: X_MSB Register (Read Only) ............................................................................................. 22

0x02 OUT_Y_MSB: Y_MSB Register (Read Only) ............................................................................................. 22

0x03 OUT_Z_MSB: Z_MSB Register (Read Only) ............................................................................................. 22

0x05 - 0x0A: OUT_MSB and OUT_LSB 12-Bit XYZ Data Registers ........................................................................... 22

0x05 OUT_X_LSB: X_LSB Register (Read Only) ............................................................................................... 22

0x06 OUT_X_MSB: X_MSB Register (Read Only) ............................................................................................. 22

0x07 OUT_Y_LSB: Y_LSB Register (Read Only) ............................................................................................... 22

0x08 OUT_Y_MSB: Y_MSB Register (Read Only) ............................................................................................. 22

0x09 OUT_Z_LSB: Z_LSB Register (Read Only) ............................................................................................... 22

0x0A OUT_Z_MSB: Z_MSB Register (Read Only) ............................................................................................. 22

0x0C - 0x0E: OUT_X_DELTA, OUT_Y_DELTA, OUT_Z_DELTA AC Data Registers ................................................ 23

0x0C OUT_X_DELTA: AC X 8-Bit Data Register (Read Only) ........................................................................... 23

0x0D OUT_Y_DELTA: AC Y 8-Bit Data Register (Read Only) ........................................................................... 23

0x0E OUT_Z_DELTA: AC Z 8-Bit Data Register (Read Only) ............................................................................ 23

0x0F: WHO_AM_I Device ID Register ......................................................................................................................... 23

0x0F WHO_AM_I: Device ID Register (Read Only) ............................................................................................23

6.2

32 Sample FIFO ........................................................................................................................................................ 23

0x10: F_STATUS FIFO Status Register ...................................................................................................................... 23

0x10 F_STATUS: FIFO STATUS Register (Read Only) ..................................................................................... 23

Table 13. FIFO Flag Event Description ..................................................................................................................... 23

Table 14. FIFO Sample Count Description ............................................................................................................... 24

0x11: F_8DATA 8-Bit FIFO Data ................................................................................................................................. 24

0x11 F_8DATA: 8-Bit FIFO Data Register Points to Register 0x01 (Read Only) ................................................ 24

0x12: F_12DATA 12-Bit FIFO Data ............................................................................................................................. 24

0x12 F_12DATA: 12-Bit FIFO Data Register Points to Register 0x05 (Read Only) ............................................ 24

0x13: F_SETUP FIFO Setup Register ......................................................................................................................... 24

0x13 F_SETUP: FIFO Setup Register (Read/Write) ........................................................................................... 24

0x14: SYSMOD System Mode Register ...................................................................................................................... 25

0x14 SYSMOD: System Mode Register (Read Only) ......................................................................................... 25

Table 15. SYSMOD Description ................................................................................................................................ 25

Table 16. F_SETUP Description ............................................................................................................................... 25

0x15: INT_SOURCE System Interrupt Status Register ............................................................................................... 26

0x15 INT_SOURCE: System Interrupt Status Register (Read Only) ..................................................................26

Table 17. INT_SOURCE Description ........................................................................................................................ 26

0x16: XYZ_DATA_CFG Sensor Data Configuration Register ..................................................................................... 27

0x16 XYZ_DATA_CFG: Sensor Data Configuration Register (Read/Write) ....................................................... 27

Table 18. XYZ_DATA_CFG Description ................................................................................................................... 27

0x17: HP_FILTER_CUTOFF High Pass Filter Register ............................................................................................... 27

0x17 HP_FILTER_CUTOFF: High Pass Filter Register (Read/Write) .................................................................27

Table 19. HP_FILTER_CUTOFF Setting Options ..................................................................................................... 27

6.3

Portrait/ Landscape Embedded Function Registers .................................................................................................. 27

0x18: PL_STATUS Portrait/Landscape Status Register .............................................................................................. 27

0x18 PL_STATUS Register (Read Only) ............................................................................................................ 27

0x19: PL_PRE_STATUS Portrait/Landscape Previous Data Status Register ............................................................. 28

0x19 PL_PRE_STATUS Register (Read Only) ................................................................................................... 28

0x1A: PL_CFG Portrait/Landscape Configuration Register ......................................................................................... 28

0x1A PL_CFG Register (Read/Write) .................................................................................................................. 28

Table 20. PL_CFG Register Description ................................................................................................................... 28

0x1B: PL_COUNT Portrait Landscape Debounce Register ......................................................................................... 28

0x1B PL_COUNT Register (Read/Write) ............................................................................................................ 28

Table 21. PL_STATUS Register Description ............................................................................................................ 28

Table 22. PL_COUNT Relationship with the ODR .................................................................................................... 29