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deepakomanna
Joined: 06 Mar 2007
Posts: 92
Location: Pune,India
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| 12f629 reset problem |
 Posted: Thu Oct 04, 2007 10:53 pm |
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Dear sir,
here i am using 12f629, MPLAB 7.5 Ver. & CCS PCM C Compiler, Version 3.249, 34534
In my circuit i have connected switch to pin no. 4 and LED at pin no. 5
And using internal MCLR. I have to make LED ON whenever switch is ON
i.e. closed & i/p at pin no. 4 is logic zero.
And OFF when switch is OFF i.e. open & i/p at pin no. 4 is logic one.
for this purpose i used the statements like this,
if(INPUT(PIN_A3)== 0)
LED ON; //switch closed i.e s/w ON
else
LED OFF; // switch open i.e. s/w OFF
BUT for this i am not using any pull up for switch & making this pin as out put pin.
Bcz i want check only logic level of pin no.4
This is working OK,
But sometimes the microcontroller not reseting.forcefully I have to connect pin no.4
to GND.
it is necessary to make pin no.4 as input to check logic level to avod reseting problem
_________________
Thank You,
With Best Regards,
Deepak. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Oct 05, 2007 12:17 am |
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| Post the test program. |
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deepakomanna
Joined: 06 Mar 2007
Posts: 92
Location: Pune,India
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| 12f629 reset problem |
| Posted: Fri Oct 05, 2007 2:30 am |
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Here is my test programe,
| Code: | #if defined(__PCM__)
#include<12F629.h>
#fuses INTRC_IO,NOWDT,PUT,NOMCLR,PROTECT,NOCPD,BROWNOUT
//Internal RC Osc, no CLKOUT,No Watch Dog Timer,Power Up Time ON,Internal MCLR,Code Protect ON,No EE protection,Brownout detect ON,
#use delay(clock = 4000000) // INTERNAL 4 MHz FREQ.
void main()
{
PORT_A_PULLUPS(FALSE);
SET_TRIS_A(0x00);
SETUP_COMPARATOR(NC_NC_NC_NC); // Make comparator off
while(TRUE)
{
if(INPUT(PIN_A3) == 0)
OUTPUT_HIGH(PIN_A2);
else
OUTPUT_LOW(PIN_A2);
}
}
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_________________
Thank You,
With Best Regards,
Deepak. |
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adrian
Joined: 08 Sep 2003
Posts: 92
Location: Glasgow, UK
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| Posted: Fri Oct 05, 2007 5:47 am |
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OK there are a number of things wrong here.
| Quote: | | In my circuit i have connected switch to pin no. 4 and LED at pin no. 5 And using internal MCLR. |
and
| Quote: | | But sometimes the microcontroller not reseting.forcefully I have to connect pin no.4 to GND. |
If you use the internal MCLR, the only way to reset the device is to turn the power off and on again.
Also
| Quote: | | & making this pin as out put pin. |
You cant - MCLR pin is an input only.
| Quote: | | BUT for this i am not using any pull up for switch |
You need a pull up resistor, otherwise the pin is floating.
I see that you have dabbled with
| Quote: | | PORT_A_PULLUPS(FALSE); |
If you are hoping to use the internal pull up resistor for the switch - you can't because there isn't one.
Although not stated, you do have resistors on the LED I hope?
You will also have to look at debouncing of you switch. |
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