PC312XDP512F0CFVR datasheet(962/1348 Pages) FREESCALE

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Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

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Freescale Semiconductor

Figure 23-76. Illustration of I/O Pin Functionality

23.0.6.4

Reduced Drive Register

If the pin is used as an output this register allows the configuration of the drive strength.

23.0.6.5

Pull Device Enable Register

This register turns on a pull-up or pull-down device. It becomes active only if the pin is used as an input

or as a wired-OR output.

23.0.6.6

Polarity Select Register

This register selects either a pull-up or pull-down device if enabled. It becomes active only if the pin is

used as an input. A pull-up device can be activated if the pin is used as a wired-OR output. If the pin is

used as an interrupt input this register selects the active interrupt edge.

23.0.6.7

Wired-OR Mode Register

If the pin is used as an output this register turns off the active high drive. This allows wired-OR type

connections of outputs.

23.0.6.8

Interrupt Enable Register

If the pin is used as an interrupt input this register serves as a mask to the interrupt flag to enable/disable

the interrupt.

23.0.6.9

Interrupt Flag Register

If the pin is used as an interrupt input this register holds the interrupt flag after a valid pin event.

DDR

output enable

module enable

PTI

data out

Module

PC312XDP512F0CFVR Datasheet(PDF) 962 Page - Freescale Semiconductor, Inc