Does anyone have a good solution for the 1-2 us delay between the
divider reset (or start) and the first (and later) pulses?
I think this might be a good reason to put a serial port on one of the
pins. Then, you could send the divider skip x steps or add x steps.
I'm not sure if it would
Hi Bill,
No, of course it isn't. But for a function as critical
as this, surely one would look at the assembly generated.
There will no doubt be need to adjust things a little bit.
It might end up being something more like:
while(1){
delay_us(4);
#asm
NOP
#endasm
Hi Glenn:
The PIC uC chips all divide the incoming oscillator signal by 4 to
generate a set of 4 internal clock signals so the actual instruction
frequency is Fin/4.
A 10 MHz input results in a 2.5 Mhz instruction cycle frequency, or 400
ns per instruction. Any code in the PIC that involves a
Right, this is essentially what my (and any other) PIC divider does.
Simple, isn't it?
And those 8-pin PICs are too cute to pass up.
Yup. I saw the light when I was trying to work out a 1/2 second delay with
something like a 555. I couldn't quite get what I wanted. Simple in
software.
Hi Tom,
The CCS C compiler does just fine. When you use the delay function,
it is smart enough to know when it is better to insert a few NOP
instructions (and other time wasters), and when it is better to toss
in a loop. The code it generates is generally better than I can do
myself using
