The timer is relatively simple, and there is nothing much to say.
Keywords：PIC
Reference address：PIC16-bit MCU CAN (7) Timer
Each timer module is a 16-bit timer/counter consisting of the following readable/writable registers:
? TMRx: 16-bit timer count register
? PRx: 16-bit timer period register associated with the timer
? TxCON: 16-bit timer control register associated with the timer
have to be aware of is:
1: The timer is 16 bits, and can also be configured as 32 bits. Please refer to the document for details. A 16-bit timer is used here.
2: PRx: 16-bit timer period register associated with the timer. That is, an interrupt is generated when the value of TMRx is equal to the value of PRx. 】
Let’s look at the program:
/******************************************************************
Initialize Time1 to timer mode
parameter:
none
******************************************************************/
void Time1Init(void)
{
T1CONbits.TON = 0; // Disable Timer
T1CONbits.TCS = 0; // Select internal instruction cycle clock
T1CONbits.TGATE = 0; // Disable Gated Timer mode
T1CONbits.TCKPS = 0b11; // Select 1:256 Prescaler
TMR1 = 0x00; // Clear timer register
PR1 =46875; // Load the period value, which is equivalent to generating an interrupt once per second
T1CONbits.TON = 1; // Enable Timer
}
The interrupt handling function is
/******************************************************************
Timer 1 interrupts once every 1s and sends CAN data once
parameter:
none
******************************************************************/
void __attribute__((__interrupt__, no_auto_psv)) _T1Interrupt(void)
{
IFS0bits.T1IF = 0; //Clear Timer1 interrupt flag
Ecan1_WriteMessage(AD_Data); //CAN sends data
}
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