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AT91SAM7X128C-CU

AT91SAM ARM-based Flash MCU

Atmel Corporation 

SAM7X512/256/128 Summary

9.3 Power Management Controller

The Power Management Controller uses the Clock Generator outputs to provide:

• the Processor Clock PCK

• the Master Clock MCK

• the USB Clock UDPCK

• all the peripheral clocks, independently controllable

• four programmable clock outputs

The Master Clock (MCK) is programmable from a few hundred Hz to the maximum operating fre-

quency of the device.

The Processor Clock (PCK) switches off when entering processor idle mode, thus allowing

reduced power consumption while waiting for an interrupt.

Figure 9-3. Power Management Controller Block Diagram

SLCK

MAINCK

PLLCK

Master Clock Controller

Prescaler

/1,/2,/4,...,/64

Processor

Clock

Controller

Idle Mode

Peripherals

Clock Controller

ON/OFF

PCK

int

MCK

periph_clk[2..18]

SLCK

MAINCK

PLLCK

Programmable Clock Controller

Prescaler

/1,/2,/4,...,/64

pck[0..3]

PLLCK

USB Clock Controller

ON/OFF

Divider

/1,/2,/4

UDPCK

9.4 Advanced Interrupt Controller

• Controls the interrupt lines (nIRQ and nFIQ) of an ARM Processor

• Individually maskable and vectored interrupt sources

– 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

sources

• 8-level Priority Controller

– Drives the normal interrupt nIRQ of the processor

– Handles priority of the interrupt sources

27

6120GS–ATARM–07-Apr-11

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