at91sam7l128 ATMEL Corporation, at91sam7l128 Datasheet - Page 34

• Manufacturer Part Number: at91sam7l128
• Description: At91 Arm Thumb-based Microcontroller
• Manufacturer: ATMEL Corporation

9.6
9.7
34
Advanced Interrupt Controller
Debug Unit
AT91SAM7L128/64 Preliminary
Figure 9-3.
• Controls the interrupt lines (nIRQ and nFIQ) of an ARM Processor
• Individually maskable and vectored interrupt sources
• 8-level Priority Controller
• Vectoring
• Protect Mode
• Fast Forcing
• General Interrupt Mask
• Comprises:
– Source 0 is reserved for the Fast Interrupt Input (FIQ)
– Source 1 is reserved for system peripherals (RTC, PIT, EFC, PMC, DBGU, etc.)
– Other sources control the peripheral interrupts or external interrupts
– Programmable edge-triggered or level-sensitive internal sources
– Programmable positive/negative edge-triggered or high/low level-sensitive external
– Drives the normal interrupt nIRQ of the processor
– Handles priority of the interrupt sources
– Higher priority interrupts can be served during service of lower priority interrupt
– Optimizes interrupt service routine branch and execution
– One 32-bit vector register per interrupt source
– Interrupt vector register reads the corresponding current interrupt vector
– Easy debugging by preventing automatic operations
– Permits redirecting any interrupt source on the fast interrupt
– Provides processor synchronization on events without triggering an interrupt
– One two-pin UART
– One Interface for the Debug Communication Channel (DCC) support
sources
Power Management Controller Block Diagram
MAINCK
MAINCK
PLLCK
PLLCK
SLCK
SLCK
Master Clock Controller
Programmable Clock Controller
/1,/2,/4,...,/64
Prescaler
/1,/2,/4,...,/64
Prescaler
Processor
Controller
Idle Mode
Clock Controller
Clock
Peripherals
ON/OFF
PCK
int
MCK
periph_clk[2..14]
pck[0..2]
6257AS–ATARM–28-Feb-08