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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT43USB353M датащи(PDF) 18 Page - ATMEL Corporation |
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AT43USB353M датащи(HTML) 18 Page - ATMEL Corporation |
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18 / 95 page  18 AT43USB353M 3307B–USB–4/04 Figure 5. AT43USB353M Interrupt Structure Reset Sources The AT43USB353M has four sources of reset: • Power-on Reset – The MCU is reset when the supply voltage is below the power-on reset threshold. • External Reset – The MCU is reset when a low level is present on the RESETN pin for more than 50 ns. • Watchdog Reset – The MCU is reset when the watchdog timer period expires and the watchdog is enabled. • USB Reset – The AT43USB353M has a feature to separate the USB and microcontroller resets. This feature is enabled by setting the BUS INT EN, bit 3 of the SPRSIE register. A USB bus reset is defined as a SE0 (single ended zero) of at least 4 slow speed USB clock cycles received by Port0. The internal reset pulse to the USB hardware and microcontroller lasts for 24 oscillator periods. – Resets not separated: A USB bus reset will also reset the microcontroller. – Separated reset: A USB bus reset will only reset the USB hardware, while an interrupt to the microcontroller will be generated if the BUS INT MSK bit, bit 3 of SPRSMSK register, is also set. When the USB hardware is reset, the compound device is de-configured and has to be re- enumerated by the host. When the microcontroller is reset, all I/O registers are then set to their initial values, and the program starts execution from address $000. The instruction placed in Suspend/Resume Register Suspend/Resume Interrupt Enable Register Suspend/Resume Interrupt Mask Register USB Interrupt Flag Register USB Interrupt Enable Register USB Interrupt Mask Register USB ADC TIMER0 OVF TIMER1 OVF TIMER1 COMPB TIMER1 COMPA TIMER1CAPT INT1 INT0 RESET Microcontroller Interrupt Logic 13 12 8 7 6 5 4 3 2 1 SOF EOF2 FEP3 FEP2 FEP1 FEP0 RESERVED HEP0 FRMWUP RSM GLB SUSP BUS RESET |
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