MAC7200 datasheet(925/976 Pages) FREESCALE

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Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

847

This gives a CONFIG register value of 0x0040

5. Intended use for Port B1: an input interrupt/wakeup signal with the following characteristics:

— Active high interrupt with pull-down

This gives us a CONFIG register value of 0x000B

(Write ’1’ to the PIFR register to ensure that any pending interrupts are cleared)

6. Write 0x0040 to ’Base + 0x040’ and 0x000B to ’Base + 0x042’. Use the following example code

to do this:

In File registers.h:

#define PIM_BASE_ADDRESS

0xFC0E8000/* Example only ! */

/* Following example assumes short is 16-bits */

volatile unsigned short *CONFIG_B0 = (volatile unsigned short *)

(PIM_BASE_ADDRESS+0x0040);

volatile unsigned short *CONFIG_B1 = (volatile unsigned short *)

(PIM_BASE_ADDRESS+0x0042);

In File main.c:

#include "registers.h"

*CONFIG_B0 = 0x0040;

*CONFIG_B1 = 0x000B;

34.8.2.2

Accessing Data

For maximum flexibility, the value of signals may be driven or sampled both on a pin basis and a port

(16-pin) basis, by the processor core or via a DMA. This section details how to drive and sample pins, as

well as several examples.

34.8.2.2.1

Driving/Sampling an Entire Port

To drive or sample and entire port (16 pins), you must first configure the pins, following the steps outlined

in Section 34.8.2.1, “Initialization.” Once this is done, you may drive a value onto the pins (output mode)

or sample values from the pins (input mode) by writing or reading the appropriate PORTDATA register.

Note that writing to pins that are specified as inputs will have no effect. Conversely, reading from pins that

are specified as outputs will simply return the last value written into the PORTDATA register. In this

manner, it is possible to use the PORTDATA register to drive or sample less than the full 16 pins in a port.

The following example illustrates this point.

Example 34-3. Configure Port B to use the IIC Module, 10 outputs and 4 inputs. Sample the 4 inputs and

drive 0x3FF onto the 10 outputs.

In File registers.h:

#define PIM_BASE_ADDRESS

0xFC0E8000/* Example only ! */

/* Following example assumes short is 16-bits */

volatile unsigned short *CONFIG_B0 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0040);

volatile unsigned short *CONFIG_B1 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0042);

volatile unsigned short *CONFIG_B2 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0044);

volatile unsigned short *CONFIG_B3 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0046);

volatile unsigned short *CONFIG_B4 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0048);

volatile unsigned short *CONFIG_B5 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x004A);

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