ST18D952 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST18D952' PDF : 67 Pages View PDF
ST18952
8 Interrupt Controller
The interrupt controller (ITC) can manage up to eight external interrupts. The interrupt
controller has the following features:
• 8 independent interrupt sources, each one associated with:
• 16-bit programmable interrupt vector - provides the address of the first instruction
of the interrupt routine associated with the source.
• mask bit, enabling each source to be activated or deactivated
• sensitivity bit (edge/level)
• 2-bit programmable priority level
• ‘pending interrupt’ flag - displays the source waiting for service. This flag is writ-
able to allow a software interrupt capability.
• Interrupt processing whenever its priority level is higher than the current priority
level.
• Nested of up to 4 interrupts(the stack content is accessible in read or write).
Figure 8.1 D950Core interrupt controller
AS-DSP
16
YD
YA
16
D950Core
IT
ITACK
EOI
YWR
YRD
INCYCLE
IT
ITACK
EOI INTERRUPT
YWR CONTROLLER
YRD PERIPHERAL
CLK
ITRQ0
ITRQ1
ITRQ2
ITRQ3
ITRQ4
ITRQ5
ITRQ6
ITRQ7
RESET
VR02020C
The interrupt controller ITRQ inputs can be connected to external interrupt requests or to
internal peripheral requests, this is dependent on the setting of the port/interrupt control (PICR)
system register, see Table on page 43 for details. The interrupt controller receives interrupt
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