908E626_09 Datasheet, PDF (20/44 Pages) Freescale Semiconductor, Inc – Integrated Stepper Motor Driver with Embedded MCU and LIN Serial Communication

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
HTIE — HIGH TEMPERATURE INTERRUPT
ENABLE BIT
This read / write bit enables CPU interrupts by the high
temperature flag, HTF. Reset clears the HTIE bit.
• 1 = Interrupt requests from HTF flag enabled.
• 0 = Interrupt requests from HTF flag disabled.
LVIE — LOW VOLTAGE INTERRUPT ENABLE BIT
This read / write bit enables CPU interrupts by the low
voltage flag, LVF. Reset clears the LVIE bit.
• 1 = Interrupt requests from LVF flag enabled.
• 0 = Interrupt requests from LVF flag disabled.
HVIE — HIGH VOLTAGE INTERRUPT ENABLE BIT
This read / write bit enables CPU interrupts by the high
voltage flag, HVF. Reset clears the HVIE bit.
VDD
RST_A
• 1 = Interrupt requests from HVF flag enabled.
• 0 = Interrupt requests from HVF flag disabled.
OCIE — OVER-CURRENT INTERRUPT ENABLE BIT
This read / write bit enables CPU interrupts by the
overcurrent flag, OCF. Reset clears the OCIE bit.
• 1 = Interrupt requests from OCF flag enabled.
• 0 = Interrupt requests from OCF flag disabled.
RESET
The 908E626 chip has four internal reset sources and one
external reset source, as explained in the paragraphs below.
Figure 10 depicts the internal reset sources.
SPI REGISTERS
AWDRE Flag
HVRE Flag
HTRE Flag
AWD Reset
Sensor
High-Voltage
Reset Sensor
High-Temperature
Reset Sensor
Low-Voltage Reset
MONO
FLOP
Figure 10. Internal Reset Routing
RESET INTERNAL SOURCES
Autonomous Watchdog
AWD modules generates a reset because of a timeout
(watchdog function).
High Temperature Reset
To prevent damage to the device, a reset will be initiated if
the temperature rises above a certain value. The reset is
maskable with bit HTRE in the Reset Mask Register. After a
reset the high temperature reset is disabled.
Low Voltage Reset
The LVR is related to the internal V_DD. In case the voltage
falls below a certain threshold, it will pull down the RST_A pin.
High Voltage Reset
The HVR is related to the external V_SUP voltage. In case
the voltage is above a certain threshold, it will pull down the
RST_A pin. The reset is maskable with bit HVRE in the Reset
Mask Register. After a reset the high voltage reset is
disabled.
908E626
20
Analog Integrated Circuit Device Data
Freescale Semiconductor