MMA8652FC datasheet(34/65 Pages) NXP

34 / 65 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.7.2

0x11 Portrait/Landscape Configuration register

The Portrait/Landscape Configuration register enables the portrait/landscape function and sets the behavior of the debounce

counter.

6.7.3

0x12 Portrait/Landscape Debounce register

The Portrait/Landscape Debounce register sets the debounce count for the orientation state transition. The minimum debounce

latency is determined by the data rate (which is set by the product of the selected system ODR and PL_COUNT registers). Any

transition from WAKE to SLEEP (or SLEEP to Wake) resets the internal Landscape/Portrait debounce counter.

NOTE

The debounce counter weighting (time step) changes, based on the ODR and the

Oversampling mode. Table 40 explains the time step value for all sample rates and all

Oversampling modes.

Table 36. 0x11 PL_CFG register (Read/Write)

Back to Register Address Map

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DBCNTM

PL_EN

—

Table 37. PL_CFG register

Bit(s)

Field

Description

7DBCNTM

Debounce counter mode selection

0 Decrements debounce whenever the condition of interest is no longer valid.

1 Clears the counter whenever the condition of interest is no longer valid. (default)

PL_EN

Portrait/Landscape detection enable

0 Portrait/Landscape Detection is disabled. (default)

1 Portrait/Landscape Detection is enabled.

5–0

—

Can be 0 or 1.

Table 38. 0x12 PL_COUNT register (Read/Write)

Back to Register Address Map

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]

Table 39. PL_COUNT register

Bit(s)

Field

Description

7–0

DBCNE[7:0]

Debounce Count value

0000_0000 (default)

Table 40. PL_COUNT relationship with the ODR

ODR

(Hz)

Max Time Range (s)

Time Step (ms)

Normal

LPLN

HighRes

Normal

LPLN

HighRes

800

0.319

1.25

400

0.638

2.5

200

1.28

0.638

1.28

2.5

100

2.55

0.638

2.55

2.5

5.1

0.638

5.1

2.5

12.5

5.1

20.4

0.638

20.4

2.5

6.25

5.1

20.4

0.638

40.8

2.5

160

1.56

5.1

20.4

0.638

40.8

2.5

160

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