MMA8652FC datasheet(54/77 Pages) FREESCALE

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MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.11.2

0x22: PULSE_SRC Pulse Source register

The PULSE_SRC register indicates a double or single pulse event has occurred (and also which direction). The corresponding

axis and event must be enabled in register 0x21 for the event flag to be asserted in the source register.

•

When the EA bit gets set while ELE = 1, all status bits (AxZ, AxY, AxZ, DPE, and PolX, PolY, PolZ) are frozen.

•

Reading the PULSE_SRC register clears all bits.

•

Reading the source register will clear the interrupt.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

AxZ

AxY

AxX

DPE

PolZ

PolY

PolX

Figure 46. 0x22 PULSE_SRC register (Read-Only)

Table 46. PULSE_SRC register

Bit

Field

Description

7EA

Event Active Flag

0 No interrupt has been generated (default)

1 One or more interrupt events have been generated

6AxZ

Z-axis event

0 No interrupt (default)

1 Z-axis event has occurred

5AxY

Y-axis event

0 No interrupt (default)

1 Y-axis event has occurred)

4AxX

X-axis event

0 No interrupt (default)

1 X-axis event has occurred

3DPE

Double pulse on first event

0 Single pulse event triggered interrupt (default)

1 Double pulse event triggered interrupt

2PolZ

Pulse polarity of Z-axis event

0 Pulse event that triggered interrupt was positive (default)

1 Pulse event that triggered interrupt was negative)

1PolY

Pulse polarity of Y-axis event

0 Pulse event that triggered interrupt was positive (default)

1 Pulse event that triggered interrupt was negative

0PolX

Pulse polarity of X-axis event

0 Pulse event that triggered interrupt was positive (default)

1 Pulse event that triggered interrupt was negative

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