MMA8652FC datasheet(65/77 Pages) FREESCALE

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MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.13.3

0x2C: CTRL_REG3 Interrupt Control register

CTRL_REG3 register is used to control the Auto-WAKE/SLEEP function by setting the orientation or Freefall/Motion as an

interrupt to wake. CTRL_REG3 register also configures the interrupt pins INT1 and INT2.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

FIFO_GATE

WAKE_TRANS

WAKE_LNDPRT

WAKE_PULSE

WAKE_FF_MT

IPOL

PP_OD

Figure 56. 0x2C CTRL_REG3 register (Read/Write)

Table 69. CTRL_REG3 register

Bit(s)

Field

Description

FIFO_GATE

FIFO Gate

0 FIFO gate is bypassed. (default)

FIFO is flushed upon the system mode transitioning from WAKE to SLEEP mode or from SLEEP to WAKE

mode.

1 The FIFO input buffer is blocked when transitioning from WAKE to SLEEP mode or from SLEEP to WAKE

mode, until the FIFO is flushed. Although the system transitions from WAKE to SLEEP or from SLEEP to

WAKE—the contents of the FIFO buffer are preserved, and new data samples are ignored until the FIFO is

emptied by the host application.

If the FIFO_GATE bit is set to 1 and the FIFO buffer is not emptied before the arrival of the next sample,

then the FGERR bit in the SYS_MOD register (0x0B) will be asserted. The FGERR bit remains asserted as

long as the FIFO buffer remains un-emptied. Emptying the FIFO buffer clears the FGERR bit in the

SYS_MOD register.

WAKE_TRANS

Wake from Transient interrupt

0 Transient function is bypassed in SLEEP mode. (default)

1 Transient function interrupt can wake up system

WAKE_LNDPRT

Wake from Orientation interrupt

0 Orientation function is bypassed in SLEEP mode. (default)

1 Orientation function interrupt can wake up system

WAKE_PULSE

Wake from Pulse interrupt

0 Pulse function is bypassed in SLEEP mode. (default)

1 Pulse function interrupt can wake up system

WAKE_FF_MT

Wake from Freefall/Motion interrupt

0 Freefall/Motion function is bypassed in SLEEP mode. (default)

1 Freefall/Motion function interrupt can wake up

1IPOL

Interrupt polarity

Selects the polarity of the interrupt signal.

When IPOL is 0 (default value), any interrupt event is signaled with a logical 0.

0 ACTIVE low (default)

1 ACTIVE high

PP_OD

Push-Pull/Open-Drain selection on interrupt pad

Configures the interrupt pin to Push-Pull or to Open-Drain mode.

The Open-Drain configuration can be used for connecting multiple interrupt signals on the same interrupt line.

0 Push-Pull (default)

1 Open Drain

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