mm908e625 Freescale Semiconductor, Inc, mm908e625 Datasheet - Page 40

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

Autonomous Watchdog Rate Bit (AWDR)
Autonomous Watchdog. Reset clears the AWDR bit.
VOLTAGE REGULATOR
regulator to provide internal power and external power for the
MCU. The on-chip regulator consist of two elements, the
main voltage regulator and the low-voltage reset circuit.
provides a regulated V
parameters (e.g. ICG trim value) are stored in the flash
memory of the device. The following flash memory locations
are reserved for this purpose and might have a value different
from the empty (0xFF) state:
has to take care not to erase or override these values. If these
parameters are not used, these flash locations can be erased
and otherwise used.
Trim Values
memory is explained
40
908E625
FUNCTIONAL DEVICE OPERATION
FACTORY TRIMMING AND CALIBRATION
This read/write bit selects the clock rate of the
• 1 = Fast rate selected (10 ms)
• 0 = Slow rate selected (20 ms)
The 908E625 chip contains a low-power, low-drop voltage
The V
To enhance the ease-of-use of the 908E625, various
•0xFD80:0xFDDF Trim and Calibration Values
•0xFFFE:0xFFFF Reset Vector
In the event the application uses these parameters, one
Below the usage of the trim values located in the flash
DD
regulator accepts a unregulated input supply and
DD
supply to all digital sections of the
FACTORY TRIMMING AND CALIBRATION
device. The output of the regulator is also connected to the
VDD pin to provide the 5.0 V to the microcontroller.
RUN Mode
provides a regulated supply to all digital sections.
STOP Mode
regulated output voltage. The STOP mode regulator has a
very limited output current capability. The output voltage will
be lower than the output voltage of the main voltage
regulator.
Internal Clock Generator (ICG) Trim Value
create a stable clock source for the microcontroller without
using any external components. The untrimmed frequency of
the low-frequency base clock (IBASE), will vary as much as
±25 percent due to process, temperature, and voltage
dependencies. To compensate this dependancies a ICG trim
values is located at adress $FDC2. After trimming the ICG is
a range of typ. ±2% (±3% max.) at nominal conditions (filtered
(100nF) and stabilized (4,7uF) V
will vary over temperature and voltage (VDD) as indicated in
the 68HC908EY16 datasheet.
Trim Register ICGTR at adress $38 of the MCU.
During RUN mode the main voltage regulator is on. It
During STOP mode the STOP mode regulator supplies a
The internal clock generator (ICG) module is used to
To trim the ICG this values has to be copied to the ICG
Important The value has to copied after every reset.
Analog Integrated Circuit Device Data
DD
Freescale Semiconductor
= 5V, T
Ambient
~25°C) and