ATmega16U2 datasheet(208/314 Pages) ATMEL

No. de pieza	ATmega16U2

Descripción Electrónicos	8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller

PDF	314 Pages

Scroll/Zoom	100%

Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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208

7799B–AVR–07/09

ATmega8U2/16U2/32U2

It is not possible to have overflow error during IN stage, in the CPU side, since the CPU should

write only if the bank is ready to access data (TXINI=1 or RWAL=1).

21.17 Interrupts

The next figure shows all the interrupts sources:

Figure 21-4. USB Device Controller Interrupt System

There are 2 kind of interrupts: processing (i.e. their generation are part of the normal processing)

and exception (errors).

Processing interrupts are generated when:

• Upstream resume(

UPRSMI)

• End of resume(

EORSMI)

• Wake up(

WAKEUPI)

• End of reset (Speed Initialization)(

EORSTI)

• Start of frame(

SOFI, if FNCERR=0)

• Suspend detected after 3 ms of inactivity(

SUSPI)

Exception Interrupts are generated when:

• CRC error in frame number of SOF(

SOFI, FNCERR=1)

UPRSMI

UDINT.6

UPRSME

UDIEN.6

EORSMI

UDINT.5

EORSME

UDIEN.5

WAKEUPI

UDINT.4

WAKEUPE

UDIEN.4

EORSTI

UDINT.3

EORSTE

UDIEN.3

SOFI

UDINT.2

SOFE

UDIEN.2

SUSPI

UDINT.0

SUSPE

UDIEN.0

USB Device

Interrupt

ATmega16U2 Datasheet(PDF) 208 Page - ATMEL Corporation

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