AT91SAM7SE256 ATMEL [ATMEL Corporation], AT91SAM7SE256 Datasheet - Page 32

• Manufacturer Part Number: AT91SAM7SE256
• Description: Product Description
• Manufacturer: ATMEL [ATMEL Corporation]

9.4
32
Advanced Interrupt Controller
AT91SAM7SE512/256/32 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
– Source 0 is reserved for the Fast Interrupt Input (FIQ)
– Source 1 is reserved for system peripherals (RTT, 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
sources
Power Management Controller Block Diagram
MAINCK
MAINCK
PLLCK
PLLCK
SLCK
SLCK
PLLCK
Master Clock Controller
Programmable Clock Controller
/1,/2,/4,...,/64
Prescaler
USB Clock Controller
/1,/2,/4,...,/64
ON/OFF
Divider
/1,/2,/4
Prescaler
Processor
Controller
Idle Mode
Clock Controller
Clock
Peripherals
ON/OFF
PCK
int
MCK
periph_clk[2..14]
pck[0..2]
usb_suspend
UDPCK
6222ES–ATARM–15-Dec-09