AT43USB351M datasheet(21/101 Pages) ATMEL

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AT43USB351M

3302E–USB–7/04

Figure 6. AT43USB351M Interrupt Structure

Reset Sources

The AT43USB351M 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 AT43USB351M 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.

Suspend/Resume

Interrupt Enable

Suspend/Resume

Interrupt Mask

USB Interrupt

Flag Register

USB Interrupt

Enable Register

USB Interrupt

Mask Register

USB

ADC

SPI STC

TIMER0 OVF

TIMER1 OVF

TIMER1 COMPB

TIMER1 COMPA

TIMER1CAPT

INT1

INT0

RESET

Microcontroller

Interrupt

Logic

SOF

FEP4

FEP3

FEP2

FEP1

FEP0

RESERVED

FRMWUP

RSM

GLB SUSP

BUS RESET

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