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參數資料
| 型號： | KIT908EINTFC |
| 廠商： | Freescale Semiconductor |
| 文件頁數： | 32/49頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL 908E625 QUAD W/MCU/LIN |
| 標準包裝： | 1 |
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Analog Integrated Circuit Device Data
38
Freescale Semiconductor
908E625
FUNCTIONAL DEVICE OPERATION
FACTORY TRIMMING AND CALIBRATION
STOP Mode
During STOP mode the STOP mode regulator supplies a
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.
FACTORY TRIMMING AND CALIBRATION
To enhance the ease-of-use of the 908E625, various
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:
0xFD80:0xFDDF Trim and Calibration Values
0xFFFE:0xFFFF Reset Vector
In the event the application uses these parameters, one
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
Below the usage of the trim values located in the flash
memory is explained
Internal Clock Generator (ICG) Trim Value
The internal clock generator (ICG) module is used to
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 dependencies a ICG trim
values is located at address $FDC2. After trimming the ICG
is a range of typ. ±2% (±3% max.) at nominal conditions
(filtered (100 nF) and stabilized (4,7
μF) VDD = 5.0 V,
TAMBIENT~25 °C) and will vary over temperature and voltage
(VDD) as indicated in the 68HC908EY16 datasheet.
To trim the ICG this values has to be copied to the ICG
Trim Register ICGTR at address $38 of the MCU.
Important The value has to copied after every reset.
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