AT43USB325 datasheet(21/109 Pages) ATMEL

21 / 109 page

3355C–USB–4/05

AT43USB325

Figure 4-1.

Oscillator and PLL

4.4

Reset and Interrupt Handling

The AT43USB325 provides 12 different interrupt sources with 4 separate reset vectors, each

with a separate program vector in the program memory space. Nine of the interrupt sources

share 2 interrupt reset vectors. These nine are the USB related interrupts. All interrupts are

assigned individual enable bits which must be set (one) together with the I-bit in the status regis-

ter in order to enable the interrupt.

The lowest addresses in the program memory space are automatically defined as the Reset and

Interrupt vectors. The complete list of vectors is shown in Table 4-1. The list also determines the

priority levels of the different interrupts. The lower the address, the higher is the priority level.

RESET has the highest priority, and next is INT0 – the USB Suspend and Resume Interrupt, etc.

AT43USB325

XTAL1

XTAL2

LFT

6.000 MHz

0.01 UF

0.22 UF

100

Table 4-1.

Reset and Interrupt Vectors

Vector No.

Program Address

Source

Interrupt Definition

$000

RESET

External Reset, Power-on Reset and

Watchdog Reset

$002

INT0

USB Suspend and Resume

$004

INT1

External Interrupt Request 1

$006

TIMER1 CAPT

Timer/Counter1 Capture Event

$008

TIMER1 COMPA

Timer/Counter1 Compare Match A

$00A

TIMER1 COMPB

Timer/Counter1 Compare Match B

$00C

TIMER1, OVF

Timer/Counter1 Overflow

$00E

TIMER0, OVF

Timer/Counter0 Overflow

$018

USB HW

USB Hardware

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