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18F252 to 18F2620 upgrade problem

 
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18F252 to 18F2620 upgrade problem
PostPosted: Wed Apr 11, 2007 9:45 am     Reply with quote
I've been using the 18F252 for a couple of years now but a program I've written is too big to fit into it's ROM so I got hold of a couple of 18F2620s instead. Unfortunately, the code itself seems to work but I can't get anything through the output pin A0. I've tried everything I could think of but it doesn't seem to work, even resorting to the most basic program shown below which works fine on my 18F252 but not the 2620. Is there a new flag or something I need to set to enable the outputs? Help!!!

Thanks
Simon

Code:
#include <18F2620.h>

#device adc=8

/*#FUSES NOWDT                    //No Watch Dog Timer
#FUSES WDT128                   //Watch Dog Timer uses 1:128 Postscale
#FUSES HS                       //High speed Osc (> 4mhz)
#FUSES NOPROTECT                //Code not protected from reading
#FUSES IESO                     //Internal External Switch Over mode enabled
#FUSES NOBROWNOUT               //No brownout reset
#FUSES BORV21                   //Brownout reset at 2.1V
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOCPD                    //No EE protection
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES LVP                      //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT                    //Program memory not write protected
#FUSES NOWRTD                   //Data EEPROM not write protected
#FUSES NOEBTR                   //Memory not protected from table reads
#FUSES NOCPB                    //No Boot Block code protection
#FUSES NOEBTRB                  //Boot block not protected from table reads
#FUSES NOWRTC                   //configuration not registers write protected
#FUSES NOWRTB                   //Boot block not write protected
#FUSES FCMEN                    //Fail-safe clock monitor enabled
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES PBADEN                   //PORTB pins are configured as analog input channels on RESET
#FUSES LPT1OSC                  //Timer1 configured for low-power operation
#FUSES MCLR                     //Master Clear pin enabled*/

#fuses HS, NOWDT, NOPROTECT, NOBROWNOUT

#use delay(clock=8192000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,ERRORS)


void main()
{
/*   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF|ADC_TAD_MUL_0);
   setup_spi(FALSE);
   setup_wdt(WDT_OFF);
   setup_timer_0(RTCC_INTERNAL);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   setup_low_volt_detect(FALSE);
   setup_oscillator(False);*/

   output_float(PIN_A0);

   while(1)
   {
      output_high(PIN_A0);
      printf("high\r\n");
      delay_ms(5000);
      printf("low\r\n");
      output_low(pin_A0);
      delay_ms(5000);
   }

   return;

}
jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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PostPosted: Wed Apr 11, 2007 10:18 am     Reply with quote
I'm not sure if I'm reading the default states correctly from the datasheet. But, I think it may default to LVP if not specifically set to NOLVP.

Try adding that fuse and see if it helps...

I've never had problems with the 2620.

John
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