Chào các bạn trong bài đăng này mình sẽ hướng dẫn các bạn về timer 0 trong PIC18F452.
Ảnh mô phỏng protues.
Đây là code chương trình.
#include <stdio.h>
#include <stdlib.h>
#include <pic18f452.h>
#define _XTAL_FREQ 4000000
#include "xc.h"
// CONFIG1H
#pragma config OSC = XT // Oscillator Selection bits (XT oscillator)
#pragma config OSCS = OFF // Oscillator System Clock Switch Enable bit (Oscillator system clock switch option is disabled (main oscillator is source))
// CONFIG2L
#pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOR = OFF // Brown-out Reset Enable bit (Brown-out Reset disabled)
#pragma config BORV = 20 // Brown-out Reset Voltage bits (VBOR set to 2.0V)
// CONFIG2H
#pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 128 // Watchdog Timer Postscale Select bits (1:128)
// CONFIG3H
#pragma config CCP2MUX = OFF // CCP2 Mux bit (CCP2 input/output is multiplexed with RB3)
// CONFIG4L
#pragma config STVR = OFF // Stack Full/Underflow Reset Enable bit (Stack Full/Underflow will not cause RESET)
#pragma config LVP = OFF // Low Voltage ICSP Enable bit (Low Voltage ICSP disabled)
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) not protected from Table Reads executed in other blocks)
void TRM0_init (void);
unsigned int Count = 0;
void main(void)
{
TRISCbits.TRISC0 = 0;
TMR0 = 0x05;
T0CONbits.T0PS0=1;
T0CONbits.T0PS1=0;
T0CONbits.T0PS2=0;
T0CONbits.PSA=0;
T0CONbits.T0CS = 0;
while(1)
{
if( INTCONbits.TMR0IF == 1){
INTCONbits.TMR0IF = 0;
TMR0 = 0x05;
Count++;
if(Count==5)
{
Count =0;
PORTCbits.RC0 ^= 1; //toggle the LED
}
}
}
}
Ảnh mô phỏng protues.
Đây là code chương trình.
#include <stdio.h>
#include <stdlib.h>
#include <pic18f452.h>
#define _XTAL_FREQ 4000000
#include "xc.h"
// CONFIG1H
#pragma config OSC = XT // Oscillator Selection bits (XT oscillator)
#pragma config OSCS = OFF // Oscillator System Clock Switch Enable bit (Oscillator system clock switch option is disabled (main oscillator is source))
// CONFIG2L
#pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOR = OFF // Brown-out Reset Enable bit (Brown-out Reset disabled)
#pragma config BORV = 20 // Brown-out Reset Voltage bits (VBOR set to 2.0V)
// CONFIG2H
#pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 128 // Watchdog Timer Postscale Select bits (1:128)
// CONFIG3H
#pragma config CCP2MUX = OFF // CCP2 Mux bit (CCP2 input/output is multiplexed with RB3)
// CONFIG4L
#pragma config STVR = OFF // Stack Full/Underflow Reset Enable bit (Stack Full/Underflow will not cause RESET)
#pragma config LVP = OFF // Low Voltage ICSP Enable bit (Low Voltage ICSP disabled)
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) not protected from Table Reads executed in other blocks)
void TRM0_init (void);
unsigned int Count = 0;
void main(void)
{
TRISCbits.TRISC0 = 0;
TMR0 = 0x05;
T0CONbits.T0PS0=1;
T0CONbits.T0PS1=0;
T0CONbits.T0PS2=0;
T0CONbits.PSA=0;
T0CONbits.T0CS = 0;
while(1)
{
if( INTCONbits.TMR0IF == 1){
INTCONbits.TMR0IF = 0;
TMR0 = 0x05;
Count++;
if(Count==5)
{
Count =0;
PORTCbits.RC0 ^= 1; //toggle the LED
}
}
}
}
Link download project.
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