System Integration Unit (SIU)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
6-52
Freescale Semiconductor
Preliminary
Figure 6-50. Four-to-One Internal Multiplexing Block Diagram
6.4.5.2
SIU External Interrupt Input Multiplexing
The 16 SIU external interrupt inputs can be connected to one of four external pins. The input source for
each SIU external interrupt is individually specified in the IMUX Select Register 1 (SIU_ISEL1).
shows an example of the multiplexing of an SIU external interrupt input. As shown in the
figure, the IRQ[0] input of the SIU can be connected to the PA0 pin, PD0 pin, PD10, or PG11 pin. The
remaining IRQ inputs are multiplexed in the same manner.
Figure 6-51. SIU External Interrupt Input Multiplexing
ETRIG[0]
PC4
PG4
PIT7 Channel
PIT8 Channel
SIU_ISEL0[TSEL0]
SIU
IRQ[0]
PA0
PD0
PG11
PD10
SIU_ISEL1[30:31]
SIU