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Proteus Error: "SCS bits have been set. This feature is not modeled"

Discussion in 'Microcontrollers, Programming and IoT' started by chandlerbin65nm, Sep 8, 2020.

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  1. chandlerbin65nm

    chandlerbin65nm

    1
    0
    Sep 8, 2020
    I have a problem in simulating interrupt/timer0 code in Proteus using PIC18F4520. It says,

    Code:
    #include <xc.h>
    #include <pic18f4520.h>
    #include "osciconbits.h"
    #include "stdint.h"
    #include "stdbool.h"
    
    uint8_t count = 0;
    uint8_t button = 0;
    bool button_press = false;
    
    
    void __interrupt() high_isr(void)
    {
         INTCONbits.GIEH = 0;
        
         if (INTCONbits.TMR0IF)
         {
             count++;
             if (button_press)
             {
                 button++;
             }
         }
        
         INTCONbits.GIEH = 1;
    }
    
    
    void __interrupt(low_priority) low_isr(void)
    {
        INTCONbits.GIEH = 0;
      
      
        INTCONbits.GIEH = 1;
    }
    
    
    void main(void) {
      
      
        OSCCONbits.IRCF =  0x07; //8MHz internal clock
        OSCCONbits.SCS =  0x03; //choose internal clock
              
        while(OSCCONbits.IOFS!=1);
      
      
        TRISBbits.RB6 = 0;
        TRISBbits.RB7 = 0;
      
        TRISBbits.RB1 = 1;
      
        LATBbits.LB6 = 0;
        LATBbits.LB7 = 0;
      
        T0CONbits.TMR0ON = 0;
        T0CONbits.T08BIT = 1;
        T0CONbits.T0CS = 0;
        T0CONbits.PSA = 0;
        T0CONbits.T0PS = 2; //1:8 prescaler
              
      
        RCONbits.IPEN = 1;
      
        INTCONbits.TMR0IE = 1;
        INTCON2bits.TMR0IP = 1;
      
      
        INTCONbits.GIEH = 1;
        INTCONbits.GIEL = 1;
      
        T0CONbits.TMR0ON = 1;
      
        while(1)
        {
            if (count >= 200)
            {
              
                    LATBbits.LB7 = ~LATBbits.LB7;
                    count = 0;
            }
          
            if (!button_press)
            {
                if (PORTBbits.RB1)
                {
                    button_press = true;
                }
            }
          
            if (button_press)
            {
                if (button >= 40)
                {
                    if (PORTBbits.RB1)
                    {
                        LATBbits.LB6 = ~LATBbits.LB6;
                        button_press = false;
                        button = 0;
                    }
                    else
                    {
                        button_press = false;
                        button = 0;
                    }
                }
            }
        }
      
    }
    and here's the configuration bits:

    Code:
    #ifndef OSCICONBITS_H
    #define OSCICONBITS_H
    
    #include <xc.h> // include processor files - each processor file is guarded.
    #define _XTAL_FREQ 8000000
    // PIC18F4520 Configuration Bit Settings
    
    // 'C' source line config statements
    
    // CONFIG1H
    #pragma config OSC = INTIO67    // Oscillator Selection bits (Internal oscillator block, port function on RA6 and RA7)
    #pragma config FCMEN = OFF      // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
    #pragma config IESO = OFF       // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)
    
    // CONFIG2L
    #pragma config PWRT = OFF       // Power-up Timer Enable bit (PWRT disabled)
    #pragma config BOREN = OFF      // Brown-out Reset Enable bits (Brown-out Reset disabled in hardware and software)
    #pragma config BORV = 3         // Brown Out Reset Voltage bits (Minimum setting)
    
    // CONFIG2H
    #pragma config WDT = OFF        // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
    #pragma config WDTPS = 32768    // Watchdog Timer Postscale Select bits (1:32768)
    
    // CONFIG3H
    #pragma config CCP2MX = PORTC   // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
    #pragma config PBADEN = OFF     // PORTB A/D Enable bit (PORTB<4:0> pins are configured as digital I/O on Reset)
    #pragma config LPT1OSC = OFF    // Low-Power Timer1 Oscillator Enable bit (Timer1 configured for higher power operation)
    #pragma config MCLRE = ON       // MCLR Pin Enable bit (MCLR pin enabled; RE3 input pin disabled)
    
    // CONFIG4L
    #pragma config STVREN = ON      // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
    #pragma config LVP = ON         // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled)
    #pragma config XINST = OFF      // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))
    
    // CONFIG5L
    #pragma config CP0 = OFF        // Code Protection bit (Block 0 (000800-001FFFh) not code-protected)
    #pragma config CP1 = OFF        // Code Protection bit (Block 1 (002000-003FFFh) not code-protected)
    #pragma config CP2 = OFF        // Code Protection bit (Block 2 (004000-005FFFh) not code-protected)
    #pragma config CP3 = OFF        // Code Protection bit (Block 3 (006000-007FFFh) not code-protected)
    
    // CONFIG5H
    #pragma config CPB = OFF        // Boot Block Code Protection bit (Boot block (000000-0007FFh) not code-protected)
    #pragma config CPD = OFF        // Data EEPROM Code Protection bit (Data EEPROM not code-protected)
    
    // CONFIG6L
    #pragma config WRT0 = OFF       // Write Protection bit (Block 0 (000800-001FFFh) not write-protected)
    #pragma config WRT1 = OFF       // Write Protection bit (Block 1 (002000-003FFFh) not write-protected)
    #pragma config WRT2 = OFF       // Write Protection bit (Block 2 (004000-005FFFh) not write-protected)
    #pragma config WRT3 = OFF       // Write Protection bit (Block 3 (006000-007FFFh) not write-protected)
    
    // CONFIG6H
    #pragma config WRTC = OFF       // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected)
    #pragma config WRTB = OFF       // Boot Block Write Protection bit (Boot block (000000-0007FFh) not write-protected)
    #pragma config WRTD = OFF       // Data EEPROM Write Protection bit (Data EEPROM not write-protected)
    
    // CONFIG7L
    #pragma config EBTR0 = OFF      // Table Read Protection bit (Block 0 (000800-001FFFh) not protected from table reads executed in other blocks)
    #pragma config EBTR1 = OFF      // Table Read Protection bit (Block 1 (002000-003FFFh) not protected from table reads executed in other blocks)
    #pragma config EBTR2 = OFF      // Table Read Protection bit (Block 2 (004000-005FFFh) not protected from table reads executed in other blocks)
    #pragma config EBTR3 = OFF      // Table Read Protection bit (Block 3 (006000-007FFFh) not protected from table reads executed in other blocks)
    
    // CONFIG7H
    #pragma config EBTRB = OFF      // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) not protected from table reads executed in other blocks)
    
    // #pragma config statements should precede project file includes.
    // Use project enums instead of #define for ON and OFF.
    
    
    #endif    /* XC_HEADER_TEMPLATE_H */
    And here's the circuit configuration:

    osciint.PNG
    (disregard the push-button connection, I have corrected that)

    The functionality of the code is to blink the RB7 periodically and turn on the RB6 if the push-button is pressed. Debouncing is added to the code for the button pressing. But the simulation fails and no LED's are turning on, this is the error/warning message I'm getting:

    proteuserror1.PNG

    Hope someone can answer this. Thanks!

    Regards,
    Chandler

    PS. I have tried removing the GIEH = 1 in interrupt function but the result error is still the same.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,223
    2,204
    Nov 17, 2011
    bertus likes this.
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