– Continuous Burst and Page Mode Accesses supported
3.11
Peripheral DMA Controller (PDC)
• Generates transfers to/from peripherals such as DBGU, USART, SSC, SPI and MCI
• Twenty channels
• One Master Clock cycle needed for a transfer from memory to peripheral
• Two Master Clock cycles needed for a transfer from peripheral to memory
3.12
Advanced Interrupt Controller
• Controls the interrupt lines (nIRQ and nFIQ) of an ARM
®
Processor
• Thirty-two individually maskable and vectored interrupt sources
– Source 0 is reserved for the Fast Interrupt Input (FIQ)
– Source 1 is reserved for system peripherals (ST, RTC, PMC, DBGU…)
– Source 2 to Source 31 control thirty embedded peripheral interrupts or external
interrupts
– Programmable Edge-triggered or Level-sensitive Internal Sources
– Programmable Positive/Negative Edge-triggered or High/Low Level-sensitive
External Sources
• 8-level Priority Controller
– Drives the Normal Interrupt of the processor
– Handles priority of the interrupt sources 1 to 31
– Higher priority interrupts can be served during service of lower priority interrupt
• Vectoring
– Optimizes Interrupt Service Routine Branch and Execution
– One 32-bit Vector Register per interrupt source
– Interrupt Vector Register reads the corresponding current Interrupt Vector
• Protect Mode
– Easy debugging by preventing automatic operations
• General Interrupt Mask
– Provides processor synchronization on events without triggering an interrupt
3.13
Power Management Controller
• Optimizes the power consumption of the whole system
• Embeds and controls:
– One Main Oscillator and One Slow Clock Oscillator (32.768Hz)
– Two Phase Locked Loops (PLLs) and Dividers
– Clock Prescalers
• Provides:
– the Processor Clock PCK
– the Master Clock MCK
– the USB Clocks, UHPCK and UDPCK, respectively for the USB Host Port and the
USB Device Port
8
AT91RM9200
1768E–ATARM–30-Sep-05
ATMEL [ ATMEL CORPORATION ]
