mm908e625 Freescale Semiconductor, Inc, mm908e625 Datasheet - Page 29

• Manufacturer Part Number: mm908e625
• Description: Integrated Quad Half H-bridge With Power Supply, Embedded Mcu, And Lin Serial Communication
• Manufacturer: Freescale Semiconductor, Inc

Interrupts
How and when an interrupt occurs is dependent on the
operating mode, RUN or Stop.
RUN Mode
(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
disabled independent of the state of the HxEN flags.
Analog Integrated Circuit Device Data
Freescale Semiconductor
The Hall-effect sensor input pins are interrupt capable.
In RUN mode the Hall-effect sensor input pin interrupt flag
In STOP mode the Hall-effect sensor input pins are
HxEN
HxF
Figure 15. Hall-Effect Sensor Input Pin Connected to Three-Pin Hall-Effect Sensor
Circuitry
Sense
V
Hx
GND
CYCLIC WAKE-UP
system. This wake-up function is provided by the cyclic check
wake-up feature of the AWD (Autonomous Watchdog).
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 (I
interrupt mask bit HPIE is set, an interrupt is performed. This
wakes up the MCU and starts the main voltage regulator.
three conditions exist:
The Hall-effect sensor inputs can be used to wake up the
If the cyclic check wake-up feature is enabled (AWDCC bit
The wake-up function via this input is available when all
• The two-pin Hall-effect sensor input is enabled
• The cyclic wake-up of the AWD is enabled (AWDCC =
• The Hall-effect sensor input pin interrupt is enabled
(HxEN = 1)
1); see
(HPIE = 1)
GND
Out
Figure 16
Vs
Three-Terminal Hall-Effect Sensor
LOGIC COMMANDS AND REGISTERS
FUNCTIONAL DEVICE OPERATION
Hall sensor
> I
HSCT
) and the
908E625
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