AT43USB353M datasheet(16/95 Pages) ATMEL

16 / 95 page

AT43USB353M

3307B–USB–4/04

Figure 4. Oscillator and PLL

Reset and

Interrupt Handling

The AT43USB353M provides 19 different interrupt sources with 10 separate reset vectors,

each with a separate program vector in the program memory space. Eleven of the interrupt

sources share 2 interrupt reset vectors. These 11 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

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 8. 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 Inter-

rupt, etc.

AT43USB353M

XTAL1

XTAL2

LFT

6.000 MHz

0.01 UF

0.1 UF

100

Table 8. 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

$016

ADC

ADC Conversion Complete

$018

USB HW

USB Hardware

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