MAC7200 datasheet(926/976 Pages) FREESCALE

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Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

848

Freescale Semiconductor

volatile unsigned short *CONFIG_B6 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x004C);

volatile unsigned short *CONFIG_B7 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x004E);

volatile unsigned short *CONFIG_B8 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0050);

volatile unsigned short *CONFIG_B9 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0052);

volatile unsigned short *CONFIG_B10 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0054);

volatile unsigned short *CONFIG_B11 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0056);

volatile unsigned short *CONFIG_B12 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0058);

volatile unsigned short *CONFIG_B13 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x005A);

volatile unsigned short *CONFIG_B14 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x005C);

volatile unsigned short *CONFIG_B15 = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x005E);

volatile unsigned short *PORTDATA_B = (volatile unsigned short *) (PIM_BASE_ADDRESS+0x0060);

In File main.c:

#include "registers.h"

/* Initialize Port B */

*CONFIG_B0 = 0x0080;/* Peripheral Mode */

*CONFIG_B1 = 0x0080;/* Peripheral Mode */

*CONFIG_B2 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B3 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B4 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B5 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B6 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B7 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B8 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B9 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B10 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B11 = 0x0040;/* GPIO Mode: Output */

*CONFIG_B12 = 0x0000;/* GPIO Mode: Input, No interrupt */

*CONFIG_B13 = 0x0000;/* GPIO Mode: Input, No interrupt */

*CONFIG_B14 = 0x0000;/* GPIO Mode: Input, No interrupt */

*CONFIG_B15 = 0x0000;/* GPIO Mode: Input, No interrupt */

/* Technically speaking, the above four lines of code are

not necessary because the reset value of all CONFIG

registers is 0x0000. They are shown here for the purposes

of illustration. */

/* Sample the 4 input pins */

unsigned int value;

/* Mask out bits 0-11 and shift into bit positions 0-4.

It is necessary to mask bits 0-11 because a read from

PORTDATA on output ports will return the value of the

bit in the PORTDATA register */

value = (*PORTDATA_B & 0xF000) >> 11;

/* drive the 10 output pins */

/* Shift our desired value ’0x3FF’ into bit positions 2-11.

It is not necessary to mask out any other bits (i.e.-bits

0-1 and 12-15) because writes to pins in GPIO Input or

Peripheral Mode have no effect. However, these writes do

change the value in the PORTDATA register, and therefore

will be reflected in the next read of the PORTDATA register. */

*PORTDATA_B = 0x3FF < 2;

34.8.2.2.2

Driving/Sampling Individual Pins

As can be seen from the above example, when using the PORTDATA register, it becomes necessary to

perform mask and shift operations when sampling or driving data. For smaller numbers of pins, this can

MAC7200 Datasheet(PDF) 926 Page - Freescale Semiconductor, Inc

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