ST10F276 - Stops running after 3 sec on power up, but OK when reset ?

[johnlintern9]

Posted on January 19, 2009 at 14:55

ST10F276 - Stops running after 3 sec on power up, but OK when reset ?

[johnlintern9]

Posted on December 12, 2008 at 13:17

I have designed my own board for the ST10F276 and written my own software using Tasking.

However, I have a strange problem when first powering up the board.

The micro runs fine for about 3 seconds, but then it stops running and just halts.

With power still applied, if I press the reset button on my board the program restarts and continues to run without any further problems.

The program only halts when first applying power to the board.

I have attached the schematic for my ST10 board, showing the reset and RPD pins etc (see attached stpdf).

I have attached a scope trace which was taken during power up of the board (see attached 5v-rst-rpd.jpg).

The trace shows the 5V supply, the reset signal and the RPD signal.

And below is some simple code I wrote to flash an LED every 100ms.

Like all my other programs, this program halts after 3 seconds when the board is powered up.

But then works fine when the reset button is pressed.

/****************************************************/

#include ''regf276e.h''

#define Set_Priority_02(reg) (reg |= 0x08)

sfrbit LED0 _atbit(P1L,0);

sfrbit LED1 _atbit(P1L,1);

void main(void)

{

DP1L = 0x01; // P1L.0 is an output

LED0 = 1 ; // Turn LED 0 on

T2CON = 0x0027 ; // T2 is used in reload mode

T3CON = 0x0005 ;

T3UD = 0 ;

T2 = 49910 ;

T3 = 49910 ;

Set_Priority_02(T3IC) ;

T3IE = 1 ;

T3R = 1 ;

IEN = 1 ;

while(1) { ; } // Just hang around..

}

_interrupt( 0x23 ) void T3_overflow( void )

{

LED0 ^= 1 ;

}

/****************************************************/

[ This message was edited by: john.lintern on 12-12-2008 17:50 ]

[ This message was edited by: john.lintern on 12-12-2008 17:51 ]

[ This message was edited by: john.lintern on 12-12-2008 17:52 ]

[ This message was edited by: john.lintern on 12-12-2008 17:54 ]

________________

Attachments :

5v-rst-rpd.jpg : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0Gq&d=%2Fa%2F0X0000000bXc%2FBPr6YT6tfVNJ1FEKXwFKcFFfB2kGFkuBjuHkzTHuiCU&asPdf=false

st10.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0EB&d=%2Fa%2F0X0000000bXe%2Fkm7rYv_WXhQ1SXNy9MdhxxNEUVDAO0ZfTSfpGh8edec&asPdf=false

[johnlintern9]

Posted on January 06, 2009 at 09:08

I have resolved this problem - it was a hardware design fault.

The NMI input to the micro was floating so after a few seconds some noise must have appeared on this input.

I have now pulled the NMI input up to +5V (via a 10k resistor) and it works fine.

Strange how the problem only occured on power up and not on reset ?

Anyway, problem solved :)

[gontsov]

Posted on January 15, 2009 at 02:09

How did you work with the internal flash memory? I'm searching the solution, just now have no luck :)

http://www.st.com/mcu/forums-cat-7833-5.html

[johnlintern9]

Posted on January 15, 2009 at 13:46

im a bit of an amature at all this

ive had a look but cant really see anything obvious

have you looked at my circuit diagram attached in this post ?

it looks like an automotive ecu in your picture ?

is there a chance this could be protected in some way so that you cant read the code ?

[gontsov]

Posted on January 19, 2009 at 14:55

So what answer did you get from the mcu? I have the same answer from the both, so monitor won't be active... maybe just to try another transfer protocol?...