Overview
1.3 Design of the DIO module
SIMATIC PCIe DIO4
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Compact Operating Instructions, 11/2011, A5E03493449-01
1.3.2
Output
The output part consists of the following components:
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The selector for the source of the OUTPxC.SSEL output signal.
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Mode filters OUTPxC.DMODE and OUTPxC.OMODE
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The edge detection for interrupts.
Output source
The source of each output is set to the respective bit in the OUTP output register in default
mode or after a reset. The outputs can be directly controlled by setting or deleting the bits in
OUTP. Other functions, such as PWM, can be implemented by selecting a different source.
Output interrupts
You can configure interrupts for rising, falling or both edges of the output signal for each
output:
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OUTPxC.ENREI enables an interrupt with a rising edge.
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OUTPxC.ENREI enables an interrupt with a falling edge.
The following happens if one or both interrupts are enabled and an edge is detected:
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The corresponding bits in OUTPIF, OUTPIFR and OUTPIFF are set.
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The output interrupt flag in GSR.OIF is enabled.
If the following conditions are met, the DIO triggers an interrupt:
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The output interrupts GCR.OIEN are enabled.
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The interrupts GCR.IEN are enabled.
The software can detect the source OUTPIF, OUTPIFR, OUTPIFF and must delete the
corresponding interrupts by writing the bits in OUTPIF, OUTPIFR or OUTPIFF.
