at43usb355 ATMEL Corporation, at43usb355 Datasheet - Page 20

• Manufacturer Part Number: at43usb355
• Description: At43usb355 Full-speed Usb Microcontroller With Embedded Hub, Adc And Pwm
• Manufacturer: ATMEL Corporation

Reset and
Interrupt Handling
20
AT43USB355
Figure 7. Oscillator and PLL
The AT43USB355 provides 20 different interrupt sources with 11 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 reg-
ister 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 6. 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.
Table 6. Reset and Interrupt Vectors
Vector No.
12
13
1
2
3
4
5
6
7
8
9
Program Address
$000
$002
$004
$006
$008
$00A
$00C
$00E
$010
$016
$018
6.000 MHz
0.1 UF
Y1
C1
100
R1
Source
RESET
INT0
INT1
TIMER1 CAPT
TIMER1 COMPA
TIMER1 COMPB
TIMER1, OVF
TIMER0, OVF
SPI, STC
ADC
USB HW
0.01 UF
C2
U1
LFT
XTAL1
XTAL2
AT43USB355
Interrupt Definition
External Reset, Power-on Reset and
Watchdog Reset
USB Suspend and Resume
External Interrupt Request 1
Timer/Counter1 Capture Event
Timer/Counter1 Compare Match A
Timer/Counter1 Compare Match B
Timer/Counter1 Overflow
Timer/Counter0 Overflow
SPI Serial Transfer Complete
ADC Conversion Complete
USB Hardware
2603G–USB–04/06