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Using RA3 (MCLR) as an output on 16F688

 
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bcs99



Joined: 22 Nov 2003
Posts: 32

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Using RA3 (MCLR) as an output on 16F688
PostPosted: Tue Aug 23, 2005 3:09 pm     Reply with quote
I'm trying to use the MCLR pin (RA3) as an output. I have it tied to 5V through a 47k resistor. I'm not sure the options are setup correctly.
Here is my test program.

Code:

#include <16F688.h>               
#FUSES NOWDT, INTRC_IO, BROWNOUT, NOMCLR, NOCPD, PUT, NOIESO, NOFCMEN
#USE delay( clock=8000000 )            

void main()
{
   set_tris_a( 0b00110011 );         
   set_tris_c( 0b00000110 );         
   port_a_pullups( 0b00110011 );
   setup_oscillator( OSC_8MHZ );         
   setup_adc_ports( NO_ANALOGS );      
   setup_adc( ADC_OFF );         
   setup_comparator( NC_NC_NC_NC );      
   
   while( TRUE )
   {
      delay_ms( 1 );
      output_toggle( PIN_A3 );
   }
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Aug 23, 2005 3:22 pm     Reply with quote
Look at the 16F688 data sheet in the I/O Ports section at Figure 4-4,
which is a block diagram of RA3. It has no output driver. It's an
input only pin.
bcs99



Joined: 22 Nov 2003
Posts: 32

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PostPosted: Tue Aug 23, 2005 3:25 pm     Reply with quote
Oops! You are right. I missed that.

Thanks for the quick reply.
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