NXP Semiconductors MPC5605BK, Reference Manual

Page: 331 / 964

Chapter 18 Interrupt Controller (INTC)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 331
Figure 18-11. Software vector mode handshaking timing diagram
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 18-12 . 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 18.7.2.2, 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 18.6.3.1.2, End of interrupt exception handler .
0 1 0
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