PC912XDP512F0MPVR datasheet(880/1348 Pages) FREESCALE

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Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

882

Freescale Semiconductor

22.4.1.2

Input Register

This is a read-only register and always returns the buffered state of the pin (Figure 22-76).

22.4.1.3

Data Direction Register

This register defines whether the pin is used as an input or an output.

If a peripheral module controls the pin the contents of the data direction register is ignored (Figure 22-76).

Figure 22-76. Illustration of I/O Pin Functionality

22.4.1.4

Reduced Drive Register

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

22.4.1.5

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.

22.4.1.6

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.

22.4.1.7

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.

DDR

output enable

module enable

PTI

data out

Module

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