MAC7200 datasheet(433/976 Pages) FREESCALE

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FlexBus Application Usage

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

355

17.7.5

How to Use the External Bus in Single Chip Unsecured Mode

It is possible to use the external bus in Single Chip Unsecured Mode, but the PIM must be setup first. To

do so, set the MODE bits (i.e.-Set Peripheral Mode) in the CONFIG register for each of the following pads:

•

PA0-PA15

•

PC0-PC15

•

PD0-PD2

•

PD5-PD15

and enable the clock to the FlexBus module by setting the EIMCLKEN bit in the PIMCONFIG register

in the PIM. The following code example illustrates this:

#include <stdarg.h>

#include "addr_map_defines.vrh"

#include "pim_registers.h"

void main()

{

typedef volatile unsigned char * REG8;

typedef volatile unsigned short * REG16;

volatile unsigned char

*pim_pointer;

volatile unsigned short *flexbus_pointer;

int i;

// Turn on the FlexBus clock

pim_pointer = (REG8) (PIM_REGISTER_MAP_OFFSET+0x3C2);

*pim_pointer = 0x002;

// Set PIM base address for Port A CONFIG registers

pim_pointer = (REG8) (PIM_REGISTER_MAP_OFFSET+0x01);

for (i=0; i<=15; i++) {

*pim_pointer = 0x80;

pim_pointer=pim_pointer+2;

}

// Set PIM base address for Port C CONFIG registers

pim_pointer = (REG8) (PIM_REGISTER_MAP_OFFSET+0x81);

for (i=0; i<=15; i++) {

*pim_pointer = 0x80;

pim_pointer=pim_pointer+2;

}

// Set PIM base address for Port D CONFIG registers

pim_pointer = (REG8) (PIM_REGISTER_MAP_OFFSET+0xC1);

for (i=0; i<=2; i++) {

*pim_pointer = 0x80;

pim_pointer=pim_pointer+2;

}

pim_pointer=pim_pointer+2;

for (i=5; i<=15; i++) {

*pim_pointer = 0x80;

pim_pointer=pim_pointer+2;

}

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