MAC7200 datasheet(910/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

832

Freescale Semiconductor

34.7.2

Peripheral Mode

In Peripheral mode, the peripheral functionality associated with the pin(s) are under the control of the

peripheral itself.

Peripheral mode is set on a particular pin by setting the MODE bit in the pin’s corresponding CONFIGxx

In Peripheral mode, the following register bits are unused:

•

DDR (CONFIGxx[6])

•

ODER (CONFIGxx[5])

•

PIER (CONFIGxx[1])

•

PIFR (CONFIGxx[0])

NOTE

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

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

GPI or GPO mode.

In addition, the corresponding bit in the PIFR register will not be changed while the pin is in Peripheral

mode. While in Peripheral mode, the data registers PORTDATA, PORTIR and PINDATAxx may be used

as follows:

Figure 34-19 illustrates the anatomy of a single PIM pad cell in Peripheral mode.

Table 34-46. PIM Register Behavior in Peripheral Mode

Write

Read

PORTDATA

Writing to the corresponding bit in the PORTDATA

set/clear the bit in the register. When the pin is

switched to General Purpose Output mode, the new

value will be driven onto the pin.

The value read from the PORTDATA register in

Peripheral mode depends on the current setting of

the pin’s DDR (Data Direction) bit.

• DDR = 1 (Output) - Returns the actual value in the

current PORTDATA register.

• DDR = 0 (Input) - Returns the value driven on the

pin, synchronized to the system clock. This is

identical to reading the corresponding bit in the

PORTIR register.

PORTIR

Writing to the PORTIR register will have no effect, as

it is a read-only register in all modes.

Reading from the PORTIR register will return the

value on the pin. Note that this value is internally

synchronized to the system clock, and that there is a

two clock cycle delay between the changing of the

value on the pin, and the update of the PORTIR

PINDATAxx

Writing to the PINDATAxx register is identical to

writing the corresponding bit in the PORTDATA

Reading from the PINDATAxx register is identical to

reading the corresponding bit from the PORTDATA

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