Figure 114. Timing Diagram Of Software Vector Mode Handshaking - STMicroelectronics SPC572L series Reference Manual

RM0400
clock
interrupt request to processor
hardware vector enable
interrupt vector
interrupt acknowledge
read INTC_IACKRn
write INTC_EOIRn
INTVEC in INTC_IACKRn
PRI in INTC_CPRn
peripheral interrupt request 100
18.6.3.2 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
settable interrupt requests, and when it finds an asserted interrupt request with a higher
priority than PRI in the associated INTC_CPRn, it asserts the interrupt request to the
associated processor. The INTVEC field in the associated INTC_IACKRn 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 associated processor is asserted. In addition, the value of the
interrupt vector to the associated processor matches the value of the INTVEC field in the
associated INTC_IACKRn. The rest of the handshaking is described in
Hardware vector
The handshaking near the end of the interrupt exception handler, that is the writing to the
associated INTC_EOIRn, is the same as in software vector mode. See
End of interrupt exception

Figure 114. Timing diagram of software vector mode handshaking

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115. As in software vector mode, the INTC examines the peripheral and software-
mode.
handler.
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Interrupt Controller (INTC)
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Section 18.4.2,
Section 18.6.3.1.2,
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