mm908e626 Freescale Semiconductor, Inc, mm908e626 Datasheet - Page 29

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

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
Analog Integrated Circuit Device Data
Freescale Semiconductor
To enhance the ease-of-use of the 908E626, 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
FACTORY TRIMMING AND CALIBRATION
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.
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 be copied after every reset.
FUNCTIONAL DEVICE OPERATION
DD
= 5V, T
Ambient
~25°C) and
908E626
29