Search found 23 matches

I'm having little luck making the shift & rotate left & right functions work.
In particular, I declare int xx[0]=0x0F;
x[1]=0x00;
x[2]=0x03;
x[3]=0x ...

Look at the internal equivalent circuit of a 2003 . . . to give typically 1.6v. Since Vih for A4 is typically 4v, as PCM Programmer says, you _will_ see the RMW problem.

Thanks both! I dropped the ...

see a couple msgs back. ( This forum doesn't seem to like cut & paste from other posts). It's 22K driving 2003, which has diode built in. And relay isn't hooked up yet; just an LED. Simple prog ...

Yup, I did the shadow_Port_A thing from your example -- same.

Oh yeah -- pullups & diodes . . .
It's a 22K pull-up on A4, which feeds an input to a 7-channel 2003 darlinton chip, that will (eventually) run the relay. The 2003 already incorporates suppres ...

Sorry, been a few days getting back to this project. Humberto's suggestion doesn't illustrate the problem because I can get A4 to respond momentarily, and I have put delays after the commands to see ...

#include <16F628.h>
#fuses nowdt,nolvp,intrc_io,noput,nomclr,protect
// internal clock
#use delay( clock=4000000 )
#nolist
#include <string.h>
#list

/*
A4 output to channel 3 of ...

3.152

I'm using A4 as an output (with a pullup resistor), but something continuously keeps it low. I CAN make it high by doing an output_high followed by a delay, just as a test. But without the delay, so ...

Thanks for the insight. I still can't find the page (out of 144) that shows the clock specs. I wonder if the accuracy is related more to temperature or to individual parts. If it was stable for an ...

Searching the archives didn't net me any subject lines that looked relevant.
On the 16F628 the internal clock is nice because it frees up board space & I/O pins, and works fine for many apps with ...

OK, unless it's a free upgrade, I can live with it.

Ah ha !

ver 3.152

#include <16F628.h>
int32 X ;
void Main()
{
X = 0b11110000111100001 ; // add another digit and you get
// *** Error 76 "junk.c" Line 5(24,25): Expect ;

}

I used to know where to f ...

I define a variable as int32.

Using "0b" binary notation to equate it to a constant, it won't compile if I specify more than 21 bits. Is this known?

Regards,
Don