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908E625 Datasheet(PDF) 40 Page - Freescale Semiconductor, Inc |
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908E625 Datasheet(HTML) 40 Page - Freescale Semiconductor, Inc |
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40 / 48 page  Analog Integrated Circuit Device Data 40 Freescale Semiconductor 908E625 FUNCTIONAL DEVICE OPERATION FACTORY TRIMMING AND CALIBRATION Autonomous Watchdog Rate Bit (AWDR) This read/write bit selects the clock rate of the Autonomous Watchdog. Reset clears the AWDR bit. • 1 = Fast rate selected (10 ms) • 0 = Slow rate selected (20 ms) VOLTAGE REGULATOR The 908E625 chip contains a low-power, low-drop voltage 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. The VDD regulator accepts a unregulated input supply and provides a regulated VDD supply to all digital sections of the device. The output of the regulator is also connected to the VDD terminal to provide the 5.0 V to the microcontroller. RUN Mode During RUN mode the main voltage regulator is on. It provides a regulated supply to all digital sections. 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 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) VDD = 5V, 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 adress $38 of the MCU. Important The value has to copied after every reset. |
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