System Integration Unit (SIU)
PXN20 Microcontroller Reference Manual, Rev. 1
8-70 Freescale Semiconductor
an ADC external trigger input. As shown in the figure, the start of conversion input of the ADC can be
connected to the PE10 pin, the PE11 pin, PE12 pin, PE13 pin, or the PIT2 channel. The external injected
trigger are multiplexed in the same manner.
Figure 8-71. Internal Multiplexing Block Diagram
8.4.5.2 SIU External Interrupt Input Multiplexing
The 16 SIU external interrupt inputs can be connected to one of nine external pins. The input source for
each SIU external interrupt is individually specified in the IMUX Select Register 1 (SIU_ISEL1), IMUX
Select Register 2 (SIU_ISEL2) and IMUX Select Register 2A (SIU_ISEL2A). Figure 8-72 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 PB0 pin, PC0 pin, PD0 pin, PE0 pin, PF0 pin, PG0 pin, PH0 pin, PJ0
pin, or PK0 pin The remaining IRQ inputs are multiplexed in the same manner.
Start
PE12
PE13
PIT2 Channel
SIU_ISEL4[TSEL0]
SIU
PE10
PE11
of
Conversion
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