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EB413 Datasheet(PDF) 2 Page - Motorola, Inc |
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EB413 Datasheet(HTML) 2 Page - Motorola, Inc |
2 / 12 page Engineering Bulletin EB413 2 MOTOROLA Factors which affect reset are: 1. External components attached to the RESET pin 2. Low-voltage reset (LVR) on chip 3. Power-on reset (POR) detection 4. System power-up sequence 5. Watchdog operation 6. Electrically erasable, programmable read-only memory (EEPROM) on chip 7. Battery backup 8. Device controls to its own power off 9. Partial power loss 10. HC05 clock source 11. Power applied resets These factors are explained in detail later in this application note. In most applications several factors apply and so it may be a combination of these elements of reset functionality that must be considered for the safe operation of the MCU application. Almost all HC05 and HC11 devices have an external 4-MHz or 8-MHz crystal and so it is assumed that the device will have a stable oscillator within 10 ms of VDD reaching 4 V (5-V VDD is also assumed, unless stated otherwise). Other possibilities for clock sources are discussed in HC05 Clock Source. External Components Attached to the RESET Pin At the simplest level, a battery connection is connected to the VDD pin of the HC05 device and the VDD reaches 4.5 V within 1 ms. This assumes a relatively small reservoir capacitor (for instance, 1 µF). In this case, the crystal oscillator will usually start between 5 ms and 10 ms after power on and the VDD supply will be above the minimum allowed for the system clock. Remember that the 3-V specification normally includes reduced operating frequency. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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