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PIC18F4520 Reset

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Luis F

Joined: 25 Apr 2006
Posts: 2
Location: Venezuela

PIC18F4520 Reset

Posted: Tue Jan 16, 2007 9:18 pm

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I migrate from PIC18F452 to PIC18F4520 ,but when I do a hardware reset (push button in MCLR) the program stop to run,
i need to turn off the power supply and turn on again and the program run normaly.

Any ideas? Question

Question

This is a single test code

Code:

#include <18F4520.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 BROWNOUT //Reset when brownout detected
#FUSES BORV42 //Brownout reset at 4.2V
#FUSES PUT    //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 IESO //Internal External Switch Over mode enabled
#FUSES FCMEN    //Fail-safe clock monitor enabled
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB    //Boot block not protected from table reads
#FUSES NOCPB    //No Boot Block code protection
#FUSES LPT1OSC    //Timer1 configured for low-power operation
#FUSES MCLR //Master Clear pin enabled
#FUSES NOXINST    //Extended set extension and Indexed Addressing mode disabled (Legacy mode)

#use delay(clock=10000000)

#define Led pin_A5

void main()
{

setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF|ADC_TAD_MUL_0);
setup_psp(PSP_DISABLED);
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(VREF_LOW|-2);
setup_low_volt_detect(FALSE);
setup_oscillator(False);

while(True)
{output_low(Led);
delay_ms(200);
output_high(Led);
delay_ms(200);
}

}

[/code]

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Wed Jan 17, 2007 12:09 am

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Quote:

I need to turn off the power supply and turn on again and the program
run normally.

Make sure you have a pull-up resistor on the MCLR pin.
Use 10K for Microchip ICD2, or 47K for CCS ICDU-40.

Quote:

#FUSES LVP

Change this fuse to NOLVP.

Quote:

setup_vref(VREF_LOW|-2);

The value of -2 is not defined for this function. It's there because
of a bug in the PCWH Wizard. Just delete that line. You don't
need it. The Vref module comes up in a disabled state upon
power-up reset.

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