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MMA8450QT Datasheet(PDF) 36 Page - Freescale Semiconductor, Inc |
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MMA8450QT Datasheet(HTML) 36 Page - Freescale Semiconductor, Inc |
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36 / 57 page  Sensors Freescale Semiconductor 36 MMA8450Q 6.6 Tap Detection Registers For more details of how to configure the tap detection and sample code please refer to Freescale application note, AN3919. The tap detection registers are referred to as “Pulse”. 0x2F: PULSE_CFG Pulse Configuration Register This register configures the event flag for the tap detection for enabling/disabling the detection of a single and double pulse on each of the axes. 0x30: PULSE_SRC Pulse Source Register This register indicates a double or single pulse event has occurred. The corresponding axis and event must be enabled in Register 0x2F for the event to be seen in the source register. 0x2F PULSE_CFG Register (Read/Write) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 DPA ELE ZDPEFE ZSPEFE YDPEFE YSPEFE XDPEFE XSPEFE Table 43. PULSE_CFG Description DPA Double Pulse Abort. 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 tap 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. ELE 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 ZDPEFE Event flag enable on double pulse event on Z-axis. Default value: 0 0: Event detection disabled; 1: Event detection enabled ZSPEFE Event flag enable on single pulse event on Z-axis. Default value: 0 0: Event detection disabled; 1: Event detection enabled YDPEFE Event flag enable on double pulse event on Y-axis. Default value: 0 0: Event detection disabled; 1: Event detection enabled YSPEFE Event flag enable on single pulse event on Y-axis. Default value: 0 0: Event detection disabled; 1: Event detection enabled XDPEFE Event flag enable on double pulse event on X-axis. Default value: 0 0: Event detection disabled; 1: Event detection enabled XSPEFE Event flag enable on single pulse event on X-axis. Default value: 0 0: Event detection disabled; 1: Event detection enabled 0x30 PULSE_SRC Register (Read Only) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 — EA ZDPE ZSPE YDPE YSPE XDPE XSPE Table 44. TPULSE_SRC Description EA Event Active Flag. Default value: 0 0: no event flag has been asserted; 1: one or more events have been asserted ZDPE Double pulse on Z-axis event. Default value: 0 0: no event detected; 1: Double Z event detected ZSPE Single pulse on Z-axis event. Default value: 0 0: no event detected; 1: Single Z event detected YDPE Double pulse on Y-axis event. Default value: 0 0: no event detected; 1: Double Y event detected YSPE Single pulse on Y-axis event. Default value: 0 0: no event detected; 1: Single Y event detected XDPE Double pulse on X-axis event. Default value: 0 0: no event detected; 1: Double X event detected XSPE Single pulse on X-axis event. Default value: 0 0: no event detected; 1: Single X event detected |
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