mm908e626 Freescale Semiconductor, Inc, mm908e626 Datasheet - Page 28

• Manufacturer Part Number: mm908e626
• Description: Integrated Stepper Motor Driver With Embedded Mcu And Lin Serial Communication
• Manufacturer: Freescale Semiconductor, Inc

HVDD_OCF — HVDD Output Overcurrent Flag Bit
the HVDD terminal. Clear HVDD_OCF and enable the output
by writing a logic [1] to the HVDD_OCF Flag. Reset clears the
HVDD_OCF bit. Writing a logic [0] to HVDD_OCF has no
effect.
LVF — Low-Voltage Bit
Flag Register.
HVF — High-Voltage Sensor Bit
Flag Register.
HB_OCF — H-Bridge Overcurrent Flag Bit
the H-Bridges. Clear HB_OCF and enable the H-Bridge
driver by writing a logic [1] to HB_OCF. Reset clears the
HB_OCF bit. Writing a logic [0] to HB_OCF has no effect.
HTF — Overtemperature Status Bit
Flag Register.
AUTONOMOUS WATCHDOG (AWD)
CPU against code runaways.
is set. If this bit is cleared, the AWD oscillator is disabled and
the watchdog switched off.
Watchdog
setting the AWDRE bit, watchdog functionality in RUN mode
is activated. Once this function is enabled, it is not possible to
disable it via software.
28
908E626
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
This read / write flag is set on an overcurrent condition at
• 1 = Overcurrent condition on HVDD has occurred.
• 0 = No overcurrent condition on HVDD has occurred.
This read only bit is a copy of the LVF bit in the Interrupt
• 1 = Low-voltage condition has occurred.
• 0 = No low-voltage condition has occurred.
This read-only bit is a copy of the HVF bit in the Interrupt
• 1 = High-voltage condition has occurred.
• 0 = No high-voltage condition has occurred.
This read / write flag is set on an overcurrent condition at
• 1 = Overcurrent condition on H-Bridges has occurred.
• 0 = No overcurrent condition on H-Bridges has
This read-only bit is a copy of the HTF bit in the Interrupt
• 1 = Overtemperature condition has occurred.
• 0 = No overtemperature condition has occurred.
The Autonomous Watchdog module allows to protect the
The AWD is enabled if AWDRE in the AWDCTL Register
The watchdog function is only available in RUN mode. On
occurred.
system reset is initiated. Operations of the watchdog function
cease in STOP mode. Normal operation will be continued
when the system is back to RUN mode.
counter must be reset before it reaches the end value. This is
done by a write to the AWDRST bit in the AWDCTL Register.
Autonomous Watchdog Control Register (AWDCTL)
AWDRST — Autonomous Watchdog Reset Bit
timeout period. AWDRST always reads 0. Reset clears
AWDRST bit.
AWDRE — Autonomous Watchdog Reset Enable Bit
reset on the
Watchdog has reached the timeout and the Autonomous
Watchdog is enabled. AWDRE is one-time setable (write
once) after each reset. Reset clears the AWDRE bit.
AWDR — Autonomous Watchdog Rate Bit
Autonomous Watchdog. Reset clears the AWDR bit.
VOLTAGE REGULATOR
regulator to provide internal power and external power for the
MCU. The V
and provides a regulated V
the device. The output of the regulator is also connected to
the VDD terminal to provide the 5.0 V to the microcontroller.
Reset
Notes
Read
Write
16.
If the timer reaches end value and AWDRE is set, a
To prevent a watchdog reset, the watchdog timeout
This write-only bit resets the Autonomous Watchdog
• 1 = Reset AWD and restart timeout period.
• 0 = No effect.
This read / write bit enables resets on AWD time-outs. A
• 1 = Autonomous watchdog enabled.
• 0 = Autonomous watchdog disabled.
This read / write bit selects the clock rate of the
• 1 = Fast rate selected (10 ms).
• 0 = Slow rate selected (20 ms).
The 908E626 chip contains a low-power, low-drop voltage
This bit must always be set to 0.
Bit 7
0
0
Register Name and Address: AWDCTL - $0a
DD
RST_A
6
0
0
regulator accepts a unregulated input supply
AWDRST
is asserted when the Autonomous
5
0
0
Analog Integrated Circuit Device Data
DD
AWDRE
4
0
supply to all digital sections of
Freescale Semiconductor
(14)
3
0
0
(14)
2
0
0
1
0
0
AWDR
Bit 0
0