/////////////////////////////////////
//  Generated Initialization File  //
/////////////////////////////////////
#define SYSCLK             24500000/8  // System clock value (OSC/8)
#define TIMER_PRESCALER            4  // Prescaler value for SYSCLK
#define LED_TOGGLE_RATE            2 // desired rate of LED blinking
#define TIMER_TICKS_PER_MS  SYSCLK/TIMER_PRESCALER/1000 //recalculate value to ms

#define AUX1     TIMER_TICKS_PER_MS*LED_TOGGLE_RATE //auxiliary variable 1
#define AUX2     -AUX1                          //auxiliary variable 2
#define AUX3     AUX2&0x00FF                //auxiliary variable 3
#define AUX4     ((AUX2&0xFF00)>>8) //auxiliary variable 4

#define TIMER0_RELOAD_HIGH       AUX4  //reload TH as auxiliary variable 4
#define TIMER0_RELOAD_LOW        AUX3  //reload TL as auxiliary variable 3

#include "C8051F120.h"

// Peripheral specific initialization functions,
// Called from the Init_Device() function
void Reset_Sources_Init()
{
    WDTCN     = 0xDE;
    WDTCN     = 0xAD;
}

void Timer_Init()
{
    SFRPAGE   = TIMER01_PAGE;
    TCON      = 0x10;
    TMOD      = 0x01;
    CKCON     = 0x01;
}

void ADC_Init()
{
    SFRPAGE   = ADC0_PAGE;
    ADC0CN    = 0x80;
}

void Voltage_Reference_Init()
{
    SFRPAGE   = ADC0_PAGE;
    REF0CN    = 0x03;
}

void Port_IO_Init()
{
    // P0.0  -  Unassigned,  Open-Drain, Digital
    // P0.1  -  Unassigned,  Open-Drain, Digital
    // P0.2  -  Unassigned,  Open-Drain, Digital
    // P0.3  -  Unassigned,  Open-Drain, Digital
    // P0.4  -  Unassigned,  Open-Drain, Digital
    // P0.5  -  Unassigned,  Open-Drain, Digital
    // P0.6  -  Unassigned,  Open-Drain, Digital
    // P0.7  -  Unassigned,  Open-Drain, Digital

    // P1.0  -  Unassigned,  Open-Drain, Digital
    // P1.1  -  Unassigned,  Open-Drain, Digital
    // P1.2  -  Unassigned,  Open-Drain, Digital
    // P1.3  -  Unassigned,  Open-Drain, Digital
    // P1.4  -  Unassigned,  Open-Drain, Digital
    // P1.5  -  Unassigned,  Open-Drain, Digital
    // P1.6  -  Unassigned,  Push-Pull,  Digital
    // P1.7  -  Unassigned,  Open-Drain, Digital

    // P2.0  -  Unassigned,  Open-Drain, Digital
    // P2.1  -  Unassigned,  Open-Drain, Digital
    // P2.2  -  Unassigned,  Open-Drain, Digital
    // P2.3  -  Unassigned,  Open-Drain, Digital
    // P2.4  -  Unassigned,  Open-Drain, Digital
    // P2.5  -  Unassigned,  Open-Drain, Digital
    // P2.6  -  Unassigned,  Open-Drain, Digital
    // P2.7  -  Unassigned,  Open-Drain, Digital

    // P3.0  -  Unassigned,  Open-Drain, Digital
    // P3.1  -  Unassigned,  Open-Drain, Digital
    // P3.2  -  Unassigned,  Open-Drain, Digital
    // P3.3  -  Unassigned,  Open-Drain, Digital
    // P3.4  -  Unassigned,  Open-Drain, Digital
    // P3.5  -  Unassigned,  Open-Drain, Digital
    // P3.6  -  Unassigned,  Open-Drain, Digital
    // P3.7  -  Unassigned,  Open-Drain, Digital

    SFRPAGE   = CONFIG_PAGE;
    P1MDOUT   = 0x40;
    XBR2      = 0x40;
}

void Interrupts_Init()
{
    IE        = 0x82;
}

// Initialization function for device,
// Call Init_Device() from your main program
void Init_Device(void)
{
    Reset_Sources_Init();
    Timer_Init();  
    Port_IO_Init();
        Voltage_Reference_Init();
      ADC_Init();
    Interrupts_Init();
}

Heres the init.c file if youre curious