MAC7200 datasheet(877/976 Pages) FREESCALE

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External Signal Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

799

34.1.3.2

GPIO Output Mode (CONFIG::MODE[1:0] = 0 0, CONFIG::DDR = 1)

In this mode, also called GPO Mode, the pin is used as a General Purpose Output.

34.1.3.3

GPIO Input Mode (CONFIG::MODE[1:0] = 0 0, CONFIG::DDR = 0)

In this mode, also called GPI Mode, the pin is used as a General Purpose Input.

In GPI mode, it is also possible to use the input as an external interrupt by programming the PIER and

PIFR bits accordingly. When in this mode, the input signals are passed through a glitch filter (running at

Peripheral Bus Clock speed) to avoid spurious external interrupts. The filter is designed so that it must see

4 clock cycles of a negated (passive) signal (setup time), followed by 4 clock cycles of an asserted (active)

signal (hold time) to capture the active edge, and be flagged as an interrupt.

34.2

External Signal Description

For detailed descriptions of a particular pin or pins, please refer to the specific peripheral’s documentation.

Table 34-4. PIM GPIO Mode Configuration

Definition

PORTDATA/PINDATAxx

This value is driven out the pin

PORTIR

This read-only register returns the value currently driven on the pin by the DATA register.

SLEWDIS/SLEW

Slew Rate control bits: Controls the slew rate of the pin (output only).

SLEWDIS = 0

Slew Rate control is disabled

SLEW

0 = Fast slew rate, 1 = Slow slew rate

PULL

These two register bits selects a Pullup or Pulldown on the input, according to the following

table:

00 None

01 None

10 Pulldown

11 Pullup

Table 34-5. PIM GPIO Input Mode Configuration

Definition

PORTDATA/PINDATAxx

This value has no effect.

PORTIR

This read-only register returns the value currently driven on the pin by an external device.

SLEWDIS/SLEW

Slew Rate control bits: Controls the slew rate of the pin (output only).

SLEWDIS = 0

Slew Rate control is disabled

SLEW

0 = Fast slew rate, 1 = Slow slew rate

PULL

These two register bits selects a Pullup or Pulldown on the input, according to the following

table:

00 None

01 None

10 Pulldown

11 Pullup

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