Clock Initialization in MC9S08PT60

raghavendratr — Mon, 30 Mar 2015 12:32:14 GMT

Hello Sir,

Currently, we are using Tower System TWR-S08PT60. In the default mode of clock operation(bus clock is derived from Internal reference clock), we have following questions/issues

Is it necessary to give a delay before any peripheral initialization,which is performed after reset? If so, Kindly let us know the procedure
We are trying to toggle a GPIO Pin( PTG0) with a certain delay for both Ton and Toff

In the following program, it is observed that duty cycle is increasing for increasing values of x with x>=1000.Kindly let us the know the reason

void delay_ms(unsigned int x)

{

unsigned int i,j;

for(i=0;i<x;i++)

asm

{

NOP;

}

void main()

{

PORT_PTGOE_PTGOE0=1; // configuring Port G0 as output

while(1)

{

PORT_PTGD_PTGD0=0; //Turns on LED

delay_ms(1000);

PORT_PTGD_PTGD0=1; //Turns off LED

delay_ms(1000);

}

Thanks & Regards,

Raghavendra T R

8-bit MicrocontrollersのトピックClock Initialization in MC9S08PT60

Clock Initialization in MC9S08PT60