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6.5
Single, Double and Directional Pulse-Detection Registers
For more details of how to configure the pulse detection and sample code, please refer to Freescale application note, AN4072.
The pulse-detection registers are referred to as “Pulse”.
0x21: PULSE_CFG Pulse Configuration Register
This register configures the event flag for the pulse detection for enabling/disabling the detection of a single and double pulse
on each of the axes.
0x21: PULSE_CFG Register (Read/Write)
Bit 7
DPA
Bit 6
ELE
Bit 5
ZDPEFE
Bit 4
ZSPEFE
Bit 3
YDPEFE
Bit 2
YSPEFE
Bit 1
XDPEFE
Bit 0
XSPEFE
Table 36. PULSE_CFG Description
Double Pulse Abort. Default value: 0.
DPA
ELE
ZDPEFE
ZSPEFE
YDPEFE
YSPEFE
XDPEFE
XSPEFE
0: Double Pulse detection is not aborted if the start of a pulse is detected during the time period specified by the PULSE_LTCY register.
1: Setting the DPA bit momentarily suspends the double pulse detection if the start of a pulse is detected during the time period
specified by the PULSE_LTCY register and the pulse ends before the end of the time period specified by the PULSE_LTCY register.
Pulse event flags are latched into the PULSE_SRC register. Reading of the PULSE_SRC register clears the event flag.
Default value: 0.
0: Event flag latch disabled; 1: Event flag latch enabled
Event flag enable on double pulse event on Z-axis. Default value: 0.
0: Event detection disabled; 1: Event detection enabled
Event flag enable on single pulse event on Z-axis. Default value: 0.
0: Event detection disabled; 1: Event detection enabled
Event flag enable on double pulse event on Y-axis. Default value: 0.
0: Event detection disabled; 1: Event detection enabled
Event flag enable on single pulse event on Y-axis. Default value: 0.
0: Event detection disabled; 1: Event detection enabled
Event flag enable on double pulse event on X-axis. Default value: 0.
0: Event detection disabled; 1: Event detection enabled
Event flag enable on single pulse event on X-axis. Default value: 0.
0: Event detection disabled; 1: Event detection enabled
0x22: PULSE_SRC Pulse Source Register
This 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 to be seen in the source register.
0x22: PULSE_SRC Register (Read Only)
Bit 7
EA
Bit 6
AxZ
Bit 5
AxY
Bit 4
AxX
Bit 3
DPE
Bit 2
PolZ
Bit 1
PolY
Bit 0
PolX
Table 37. PULSE_SRC Description
EA
AxZ
AxY
AxX
DPE
PolZ
PolY
PolX
Event Active Flag. Default value: 0.
(0: No interrupt has been generated; 1: One or more interrupt events have been generated)
Z-axis event. Default value: 0.
(0: No interrupt; 1: Z-axis event has occurred)
Y-axis event. Default value: 0.
(0: No interrupt; 1: Y-axis event has occurred)
X-axis event. Default value: 0.
(0: No interrupt; 1: X-axis event has occurred)
Double pulse on first event. Default value: 0.
(0: Single Pulse Event triggered interrupt; 1: Double Pulse event triggered interrupt)
Pulse polarity of Z-axis Event. Default value: 0.
(0: Pulse Event that triggered interrupt was Positive; 1: Pulse Event that triggered interrupt was negative)
Pulse polarity of Y-axis Event. Default value: 0.
(0: Pulse Event that triggered interrupt was Positive; 1: Pulse Event that triggered interrupt was negative)
Pulse polarity of X-axis Event. Default value: 0.
(0: Pulse Event that triggered interrupt was Positive; 1: Pulse Event that triggered interrupt was negative)
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.
MMA8452Q
Sensors
32
Freescale Semiconductor, Inc.
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