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wsinw
Joined: 15 Jul 2009
Posts: 3
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| 18F97J60 problem about clock |
 Posted: Wed Jul 15, 2009 4:16 am |
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I study PIC with 18F97J60 on Microchip's PICDEM.net2 board.
I've got problem about rs-232 baud rate. I measure the Tx output that too slow about 5 bit per sec. And measure the (25MHz) oscillator's output that about 6.6 kHz. What's wrong in my board? I replace that OSC with many osillator.
I think there's something about SFR or OSC option?
Please help me. Thank you. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jul 15, 2009 11:53 am |
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Post a test program that sends a continuous 0x55 byte using putc()
in a while() loop.
Post the #include, #fuses, #use delay(), #use rs232() statements,
and the main(). It must be compilable.
Post your compiler version. |
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wsinw
Joined: 15 Jul 2009
Posts: 3
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| detail |
| Posted: Wed Jul 15, 2009 12:09 pm |
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I use CCS V.4.088 , and code just simple
| Code: |
#include "18F97J60.h"
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=25000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
//hardware
#define relay1 PIN_J0
#define relay2 PIN_J1
#define relay3 PIN_J2
#define relay4 PIN_J3
#define relay5 PIN_J4
#define relay6 PIN_J5
#define relay7 PIN_J6
#define relay8 PIN_J7
unsigned int i;
unsigned int x;
void main(void)
{
output_high(relay1);
output_high(relay2);
while (1)
{
putc(0x55);
}
}
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thank you PCM programmer |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Jul 15, 2009 12:50 pm |
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| Quote: | | I measure the Tx output that too slow about 5 bit per sec. |
How are you measuring this ? With an oscilloscope or frequency counter ?
| Quote: |
And measure the (25MHz) oscillator's output that about 6.6 kHz |
How are you measuring this ? What pin are you looking at on the
oscillator or the PIC to measure the signal ?
| Quote: | | I replace that OSC with many osillator. |
Here is the User's manual for the board.
http://ww1.microchip.com/downloads/en/DeviceDoc/51623b.pdf
On page 38 (page 42 in the Acrobat reader), it shows that crystal Y2 is
25 MHz.
Here's a photo of the PicDem.net 2 board. It shows that Y2 is a surface
mount crystal, which is soldered to the board on the right side of the PIC.
http://img-europe.electrocomponents.com/largeimages/R0381564-01.jpg
Why would you remove a soldered-in factory-installed crystal,
several times ? I am not sure if I believe you. |
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bkamen
Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA
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| Posted: Wed Jul 15, 2009 11:14 pm |
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I have a picdem.net2 and it works just as expected out of the box.
I even have the CCS TCP/IP demo running on it.
The OSC is a crystal. Not an oscillator.. (with CMOS/TTL compat drive).
Figure that this was tested (and came installed with demo firmware that would have proved the functionality of the PCB out of the box).
Oy.... and now you've been soldering away at it... (double oy)
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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wsinw
Joined: 15 Jul 2009
Posts: 3
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| thank you |
| Posted: Thu Jul 16, 2009 2:52 am |
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thank to everyone ,
I configure system in some #fuse , it's too complex.
I doubtful in OSC replace. |
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