MMA8450QT datasheet(28/57 Pages) FREESCALE

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Freescale Semiconductor

MMA8450Q

NEWLP is set to 1 whenever a change in LO, BAFRO, or LAPO occurs. NEWLP bit is cleared anytime PL_STATUS register is

read.

0x19: PL_PRE_STATUS Portrait/Landscape Previous Data Status Register

This register provides the previous orientation data from the previous reading. These register definitions are the same as what

has been described in Register 0x18.

0x1A: PL_CFG Portrait/Landscape Configuration Register

This register configures the behavior of the debounce counters and also sets the Landscape/Portrait 1g lockout mechanism

threshold offset.

0x1B: PL_COUNT Portrait Landscape Debounce Register

This register sets the debounce counter for the orientation state transition. The minimum debounce latency is determined by

the data rate set by the selected system ODR and PL_COUNT registers. Any change to the ODR or device mode transitioning

from ACTIVE to STANDBY or vice versa resets the internal landscape/portrait internal debounce counters.

The debounce counter scales with the ODR, like many of the debounce counters in the other functional blocks. Table 22 shows

the relationship between the ODR, the step per count and the duration.

Table 20. PL_STATUS Register Description

NEWLP

Landscape-Portrait status change flag. Default value: 0.

0: No change, 1: BAFRO and/or LAPO and/or Z-tilt lockout value has changed

Z-Tilt Angle Lockout. Default value: 0.

0: Lockout condition has not been detected.

1: Z-Tilt lockout trip angle has been exceeded. Lockout has been detected.

BAFRO[1:0]

Back or Front orientation. Default value: 00

00: Undefined. This is the default power up state.

01: Front: Device is in the front facing orientation.

10: Back: Device is in the back facing orientation.

LAPO[2:0](1)

Landscape/Portrait orientation. Default value: 000

000: Undefined. This is the default power up state.

001: Portrait Up

010: Portrait Down

011: Landscape Right

100: Landscape Left

1. The default power up state is BAFRO (Undefined), LAPO (Undefined), and no Lockout for orientation function.

0x19 PL_PRE_STATUS Register (Read Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

—

-—

LAPO[2]

LAPO[1]

LAPO[0]

BAFRO[1]

BAFRO[0]

0x1A PL_CFG Register (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DBCNTM

PL_EN

—

GOFF[2]

GOFF[1]

GOFF[0]

Table 21. PL_CFG Register Description

DBCNTM

Debounce counter mode selection. Default value: 1

0: Decrements debounce whenever condition of interest is no longer valid.

1: Clears counter whenever condition of interest is no longer valid.

PL_EN

Portrait-Landscape Detection Enable. Default value: 0

0: Portrait-Landscape Detection is Disabled.

1: Portrait-Landscape Detection is Enabled.

GOFF

1g lockout threshold offset expressed in steps of 50mg. Default value: 011 = 1.15g.

The offset specified by the GOFF is added or subtracted from 1g to achieve the optimal 1g lockout threshold.

If GOFF = 011, then the resulting 1g lockout threshold is

±(1g + 150mg).

000: No offset.

0x1B PL_COUNT Register (Read/Write)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DBNCE[7]

DBNCE[6]

DBNCE[5]

DBNCE[4]

DBNCE[3]

DBNCE [2]

DBNCE [1]

DBNCE [0]

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