RM0046 Interrupt Controller (INTC)
Doc ID 16912 Rev 5 231/936
Figure 86. Software vector mode handshaking timing diagram
Hardware vector mode handshaking
A timing diagram of the interrupt request and acknowledge handshaking in hardware vector
mode, along with the handshaking near the end of the interrupt exception handler, is shown
in Figure 87. As in software vector mode, the INTC examines the peripheral and software
settable interrupt requests, and when it finds an asserted one with a higher priority than PRI
in INTC_CPR, it asserts the interrupt request to the processor. The INTVEC field in the
INTC_IACKR is updated with the preempting peripheral or software settable interrupt
request’s vector when the interrupt request to the processor is asserted. The INTVEC field
retains that value until the next time the interrupt request to the processor is asserted. In
addition, the value of the interrupt vector to the processor matches the value of the INTVEC
field in the INTC_IACKR. The rest of the handshaking is described in” Section , “Hardware
vector mode.
The handshaking near the end of the interrupt exception handler, that is the writing to the
INTC_EOIR, is the same as in software vector mode. Refer to Section , “End of interrupt
exception handler.
010
Clock
Interrupt request to processor
Hardware vector enable
Interrupt vector
Interrupt acknowledge
Read INTC_IACKR
Write INTC_EOIR
INTVEC in INTC_IACKR
PRI in INTC_CPR
Peripheral interrupt request 100
0 108
0
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