PIC16C63A-20/SS【PDF 72/184 页】IC MCU OTP 4KX14 PWM 28SSOP

163

SAM7S Series [DATASHEET]

6175M–ATARM–26-Oct-12

23.6

Product Dependencies

23.6.1

I/O Lines

The interrupt signals FIQ and IRQ0 to IRQn are normally multiplexed through the PIO controllers. Depending on

the features of the PIO controller used in the product, the pins must be programmed in accordance with their

assigned interrupt function. This is not applicable when the PIO controller used in the product is transparent on the

input path.

23.6.2

Power Management

The Advanced Interrupt Controller is continuously clocked. The Power Management Controller has no effect on the

Advanced Interrupt Controller behavior.

The assertion of the Advanced Interrupt Controller outputs, either nIRQ or nFIQ, wakes up the ARM processor

while it is in Idle Mode. The General Interrupt Mask feature enables the AIC to wake up the processor without

asserting the interrupt line of the processor, thus providing synchronization of the processor on an event.

23.6.3

Interrupt Sources

The Interrupt Source 0 is always located at FIQ. If the product does not feature an FIQ pin, the Interrupt Source 0

cannot be used.

The Interrupt Source 1 is always located at System Interrupt. This is the result of the OR-wiring of the system

peripheral interrupt lines, such as the System Timer, the Real Time Clock, the Power Management Controller and

the Memory Controller. When a system interrupt occurs, the service routine must first distinguish the cause of the

interrupt. This is performed by reading successively the status registers of the above mentioned system

peripherals.

The interrupt sources 2 to 31 can either be connected to the interrupt outputs of an embedded user peripheral or to

external interrupt lines. The external interrupt lines can be connected directly, or through the PIO Controller.

The PIO Controllers are considered as user peripherals in the scope of interrupt handling. Accordingly, the PIO

Controller interrupt lines are connected to the Interrupt Sources 2 to 31.

The peripheral identification defined at the product level corresponds to the interrupt source number (as well as the

bit number controlling the clock of the peripheral). Consequently, to simplify the description of the functional opera-

tions and the user interface, the interrupt sources are named FIQ, SYS, and PID2 to PID31.

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