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908E625 Datasheet(PDF) 29 Page - Freescale Semiconductor, Inc |
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908E625 Datasheet(HTML) 29 Page - Freescale Semiconductor, Inc |
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29 / 49 page  Analog Integrated Circuit Device Data Freescale Semiconductor 29 908E625 FUNCTIONAL DEVICE OPERATION LOGIC COMMANDS AND REGISTERS Figure 15. Hall-Effect Sensor Input Pin Connected to Three-Pin Hall-Effect Sensor Interrupts The Hall-effect sensor input pins are interrupt capable. How and when an interrupt occurs is dependent on the operating mode, RUN or Stop. RUN Mode In RUN mode the Hall-effect sensor input pin interrupt flag (HPF) will be set if a state change on the hallflags (HxF) is detected. The interrupt is maskable with the HPIE bit in the Interrupt Mask Register. Before enabling the interrupt, the flag should be cleared in order to prevent a wrong interrupt. STOP Mode In STOP mode the Hall-effect sensor input pins are disabled independent of the state of the HxEN flags. CYCLIC WAKE-UP The Hall-effect sensor inputs can be used to wake up the system. This wake-up function is provided by the cyclic check wake-up feature of the AWD (Autonomous Watchdog). If the cyclic check wake-up feature is enabled (AWDCC bit is set), the AWD switches on the enabled Hall-effect sensor pins periodically. To ensure that the Hall-effect sensor current is stabilized after switching on, the inputs are sensed after ~40 μs. If a 1 is detected (IHall sensor >IHSCT) and the interrupt mask bit HPIE is set, an interrupt is performed. This wakes up the MCU and starts the main voltage regulator. The wake-up function via this input is available when all three conditions exist: • The two-pin Hall-effect sensor input is enabled (HxEN = 1) • The cyclic wake-up of the AWD is enabled (AWDCC = 1); see Figure 16 • The Hall-effect sensor input pin interrupt is enabled (HPIE = 1) HxEN HxF Sense Circuitry V Hx GND Three-Terminal Hall-Effect Sensor Out Vs GND |
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