MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 10-7
field, INTC_IACKR[INTVEC]. Each interrupt exception handler address is aligned on a quad word
(16-byte) boundary. IVOR4 is unused in this mode, and software does not need to read INTC_IACKR to
get the interrupt vector number.
Figure 10-7. Hardware Vector Mode: Interrupt Exception Handler Address Calculation
The processor negates INTC’s interrupt request when automatically acknowledging the interrupt request.
However, the interrupt request to the processor will not negate if a higher priority interrupt request arrives.
Even in this case, the interrupt vector number will not update to the higher priority request until the lower
priority request is acknowledged by the processor.
The assertion of the interrupt acknowledge signal pushes the PRI value in the INTC_CPR onto the LIFO
and updates PRI in the INTC_CPR with the new priority.
10.2 External Signal Description
The INTC does not have any direct external MCU signals. However, there are sixteen external pins which
can be configured in the SIU as external interrupt request input pins. When configured in this function, an
interrupt on the pin sets a corresponding SIU external interrupt flag. These flags can cause one of five
peripheral interrupt requests to the interrupt controller. See Table 10-1 for a list of the external interrupt
pins. See the SIU chapter for more information on these pins.
Table 10-1. External Interrupt Signals
Signal
1
Pin P/A/G
2
Function
3
Description
I/O
Type
Reset
Function/
State
4
Post Reset
Function/
State
5
EMIOS[14:15] AF19:
AD18
P EMIOS[14:15] eMIOS channel (output only) O — /
WKPCFG
— /
WKPCFG
AIRQ
[0:1] External interrupt request I
G GPIO[193:194] GPIO I/O
BOOTCFG[0:1] AA25:
Y24
P BOOTCFG[0:1] Boot configuration input I BOOTCFG /
Down
— / Down
AIRQ
[2:3] External interrupt request I
G GPIO[211:212] GPIO I/O
3116150
IVPR
312827161500
+ Hardware Vector
150
0b0000INTC_IACKR[INTVEC]
PREFIX
0x0000
PREFIX
18
0b000
19
0x0000
31282716
0b0000IRQ SPECIFIC OFFSET
18
0b000
1916
= Interrupt Exception
Handler Address
Mode Offset
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