Interrupts on PIC18F252 Part 2
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1 Interrupts on PIC18F252 Part 2 Following pages list Special Function Registers (SFRs) involved in interrupt configuration and operation on PIC18F252 microcontroller. (Copied from Microchip s PIC18Fxx2 Data Sheet). There are even more registers related to interrupts on PIC18F252, but we will not need them to get our first (Timer 2) interrupt driven program running. Some of those might be explained later in the course. This overview of SFRs related to interrupts on PIC18F252 is followed by the first example of an interrupt driven program. Program is well commented and when read in conjunction with the list of registers provided below should give you a good indication of how the interrupts are handled on PIC18F252 microcontroller using C language. More complex examples will follow in the next handout. T2CON: (TIMER2 CONTROL REGISTER) This register just configures the Timer 2 operation and has been discussed in earlier lectures. Timer 2 needs to be configured in the same way again so T2CON is listed here again for your reference. PR2: (TIMER 2 PERIOD REGISTER) Nothing too interesting here (Microchip did not even produce a detailed figure of this register). PR2 is just an 8-bit readable and writable register. It is the second register used for Timer 2 configuration. It is called Timer2 period register because Timer2 (when switched on) increments from 00h until it matches PR2 and then resets to 00h on the next increment cycle. So Timer 2 does not really overflow. More accurately, as explained in PIC18Fxx2 Data Sheet when Timer 2 reaches the count stored in PR2 TMR2 to PR2 match occurres. Result is still the same Timer 2 interrupt flag (TMR2IF bit from PIR1 register) is set.
2 PIR1: (PERIPHERAL INTERRUPT REQUEST (FLAG) REGISTER 1)
3 RCON: IPR1: (PERIPHERAL INTERRUPT PRIORITY REGISTER 1)
4 INTCON:
5 PIE1:
6 EXAMPLE PROGRAM //********************************************************************** // File Name: intdemo1.c // Purpose: // This program demonstrates the use of Timer 2 interrupt on PIC18F252 micro. // Since only one interrupt is used, interrupt priority scheme is irrelevant // and can be disabled. // Still, for demonstration purposes, interrupt priority scheme is enabled // in this example and Timer 2 interrupt is given high priority. // // B. Vuksanovic 01/10/2010 //********************************************************************** #include <p18f252.h> void timer_high_isr (void); // note that if there were any low priority interrupts // they would have to use 0x18 interrupt vector #pragma code high_vector=0x08 void high_interrupt (void) _asm GOTO timer_high_isr _endasm #pragma code #pragma interrupt timer_high_isr void timer_high_isr(void) T2CONbits.TMR2ON = 0; // stop Timer 2 // do the main interrupt "task" - change the state of RB0 pin // i.e. generate the square wave on RB0 PORTBbits.RB0 = ~PORTBbits.RB0; T2CON = 0x49; PR2 = 0x7C; PIR1bits.TMR2IF = 0; T2CONbits.TMR2ON = 1; // set Timer 2 to produce // 1 ms 20 MHz // clear Timer 2 interrupt flag // start Timer 2 again void main (void) TRISB = 0x00; // configure Port B pins for output PORTB = 0; // initialise RB0 to 0 RCONbits.IPEN = 1; // enable interrupt priority scheme IPR1bits.TMR2IP = 1; // configure TMR2 interrupt to high priority PIR1bits.TMR2IF = 0; // clear TMR2 interrupt flag INTCONbits.GIEH = 1; // enable high-priority interrupts PIE1bits.TMR2IE = 1; // enable TMR2 overflow interrupt T2CON = 0x4D; // set Timer 2 to produce PR2 = 0x7C; // 1 ms 20 MHz // and start Timer at the same time while(1) // wait for interrupts in infinite loop // some useful work can now be done here :-)
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