at75c220 ATMEL Corporation, at75c220 Datasheet - Page 51

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

AIC: Advanced Interrupt Controller
The AT75C220 integrates the Atmel advanced interrupt
controller (AIC). For details on this peripheral, refer to the
datasheet, literature number 1246.
The interrupt controller is connected to the fast interrupt
request (NFIQ) and the standard interrupt request (NIRQ)
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
Figure 13. Advanced Interrupt Controller Block Diagram
Table 17. Interrupt Sources
Interrupt Source
External Interrupt Sources
Internal Interrupt Sources
Advanced Peripheral
10
11
12
13
0
1
2
3
4
5
6
7
8
9
FIQ Source
Bus (APB)
Interrupt Name
Memorization
Memorization
UARTA
MACA
MACB
OAKA
Control
PIOA
IRQ0
IRQ1
WDT
SWI
TC0
TC1
TC2
FIQ
SPI
Logic
Prioritization
Controller
Interrupt Description
Fast Interrupt (LOWP)
Watchdog Interrupt
Software Interrupt
USART A Interrupt
Timer Channel 0 Interrupt
Timer Channel 1 Interrupt
Timer Channel 2 Interrupt
PIO A Interrupt
MAC A Interrupt
Serial Peripheral Interface
External Interrupt
External Interrupt
OAK Semaphore Interrupt
MAC B Interrupt
interrupts generated by the on-chip peripherals and the two
external interrupt request lines, IRQ0 to IRQ1.
An 8-level priority encoder allows the user to define the pri-
ority between the different interrupt sources. Internal
sources are programmed to be level-sensitive or edge-trig-
gered. External sources can be programmed to be positive-
or negative-edge triggered or high- or low-level sensitive.
Manager
Manager
NFIQ
NIRQ
NIRQ
NFIQ
ARM7TDMI
Core
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