MAC7200 datasheet(913/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

835

Within a Peripheral Mode (Primary, Secondary, Tertiary), the lowest port number has priority, from

PA0...PA15, PB0...PB15, etc.

As an example, assuming that the IIC SDA functionality is available on the following pins (hypothetical

only),

•

PBO (Primary Peripheral Mode)

•

PB5 (Secondary Peripheral Mode)

•

PB10 (Secondary Peripheral Mode)

•

PB11 (Tertiary Peripheral Mode)

then the selection of the SDA input to the IIC would be done as follows:

If PBO is configured as Primary Peripheral Mode, use PB0, else...

if PB5 is configured as Secondary Peripheral Mode, use PB5, else...

if PB10 is configured as Secondary Peripheral Mode, use PB10, else...

if PB11 is configured as Tertiary Peripheral Mode, use PB11, else...

drive the SDA input to the IIC to its off value

34.7.4

General Purpose Input mode

In General Purpose Input (GPI) mode, the pin is configured as an input, with full software control of the

pad and external interrupt capability.

34.7.4.1

Overview

GPI mode is set on a particular pin by clearing the MODE and DDR bits in the pin’s corresponding

CONFIGxx register (See Section 34.8.2, “Using a Pin in GPIO Mode,” for an example).

In GPI mode, the following register bits are unused:

•

SLEW (CONFIGxx[4])

•

SLEWDIS (CONFIGxx[15])

NOTE

Even though the above bits are unused in this mode, they can still be written

to. The new value will take effect once the mode of the pin is switched to

GPO mode.

While in GPI mode, the data registers PORTDATA, PORTIR and PINDATAxx may be used as follows:

MAC7200 Datasheet(PDF) 913 Page - Freescale Semiconductor, Inc