Posted on September 25, 2007 at 23:16Hi,
I am using 72F264G2 with an 8MHz crystal. I have the following code:
int main(void)
{
DisableInterrupts;
SetBit(PADDR,7); // Test output bit
SetBit(MISCR1,4); // set input sensitivity
SetBit(MISCR1,3);
ClearBit(PCDDR,3);
SetBit(PCOR,3); // set pull-up input to generate interrupt
EnableInterrupts;
while (1)
{
Halt;
}
}
@interrupt void Ei0Interrupt(void)
{
PA7=PC3;
return;
}
The CPU is fed a square signal on PC3 from a function generator. The Interrupt routine then copies the input signal to another pin (PA7) and both signal are observed on the oscilloscope. I observe a delay of about 1 milisecond. I guess this is what it takes the CPU to go from HALT to RUN, but it seems to me a bit long.
Am I correct? I read somewhere on the forum that it takes 256 cycles to go from HALT to RUN mode
Thanks
