AT91M40800-33AI Atmel, AT91M40800-33AI Datasheet - Page 56

• Manufacturer Part Number: AT91M40800-33AI
• Description: IC ARM7 MCU 100 TQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91M40800-33AI

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

AIC: Advanced
Interrupt Controller
Figure 33. Interrupt Controller Block Diagram
Note:
56
After a hardware reset, the AIC pins are controlled by the PIO Controller. They must be configured to be controlled by the
peripheral before being used.
External Interrupt Sources
Internal Interrupt Sources
AT91X40 Series
Advanced Peripheral
FIQ Source
Bus (APB)
The AT91X40 Series has an 8-level priority, individually maskable, vectored interrupt
controller. This feature substantially reduces the software and real-time overhead in
handling internal and external interrupts.
The interrupt controller is connected to the NFIQ (fast interrupt request) and the NIRQ
(standard interrupt request) inputs of the ARM7TDMI processor. The processor’s NFIQ
line can only be asserted by the external fast interrupt request input: FIQ. The NIRQ line
can be asserted by the interrupts generated by the on-chip peripherals and the external
interrupt request lines: IRQ0 to IRQ2.
The 8-level priority encoder allows the customer to define the priority between the differ-
ent NIRQ interrupt sources.
Internal sources are programmed to be level sensitive or edge triggered. External
sources can be programmed to be positive or negative edge triggered or high- or low-
level sensitive.
The interrupt sources are listed in Table 8 and the AIC programmable registers in Table
9.
Memorization
Memorization
Control
Logic
Controller
Priority
Manager
Manager
NFIQ
NIRQ
NIRQ
NFIQ
ARM7TDMI
Core
1354D–ATARM–08/02