ST18-AU1 STMICROELECTRONICS [STMicroelectronics], ST18-AU1 Datasheet - Page 34

• Manufacturer Part Number: ST18-AU1
• Description: SIX-CHANNEL DOLBY AC3/MPEG2 AUDIO DECODER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST18-AU1
8
The interrupt controller (ITC) manages the interrupts from the clocks and timers unit, the host
interface, and the external interrupt for the DSP core. The interrupt controller also manages
input/output buffer overflow/underflow interrupts.
The interrupt controller has the following features:
The interrupt controller ITRQ inputs are connected to one external interrupt request (IRQ pin)
and to internal peripheral requests, as detailed in the table below.
Table 8.1
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INTERRUPT CONTROLLER
8 interrupt sources
interrupts can be individually enabled by software
priority level between different sources can be set by software
interrupt can be activated and programmed as edge or level triggered.
Interrupt assignments
Interrupt
ITRQ0
ITRQ1
ITRQ2
ITRQ3
ITRQ4
ITRQ5
ITRQ6
ITRQ7
Assignment
Host interface
Input FIFO
Input buffer
Output buffer
Clock timer IRQ
SPDIF timer IRQ
DMA controller
connected to the external IRQ pin