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PORTB, 7 ; Direction, 0 PORTB, 0 ; Direction, 0 Direction, 0 Down ; ; ; ;
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; Going Up No, Down Moving the LEDs Up Set the Status Flag Shift the Data Up
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Down: bsf rrf IntEnd: movf movwf swapf swapf ret e Mainline: clrf movlw movwf Direction 0x0E7 PORTB ; Start in the Middle ; Setup PWM And Monitor it, Updating PWMOn _status, w ; STATUS _w, f _w, w Restore the Context Registers STATUS, C PORTB, f ; Shift the Data Down
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bsf STATUS, RP0 ; Goto Bank 1 to set Port Direction clrf TRISB ^ 0x080 ; PORTB is Output ifdef Debug movlw 0x0D0 ; Debug - Minimum Timer Delay else movlw 0x0D7 ; Normal Operation - Maximum Timer endif movwf OPTION_REG ^ 0x080 bcf STATUS, RP0 ; Go back to Bank 0 clrf movlw movwf Loop: goto Loop TMR0 ; Start the Timer from Scratch
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(1 << GIE) + (1 << T0IE) INTCON ; Enable Interrupts ; ; Loop Here Let Interrupt Handler Work in the Background
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There are two areas of the application that I would bring to your attention. The rst is the use of a prescaler for the application, and the second is the Count variable for delaying the output. I use the prescaler set to the maximum delay for the TMR0 input (including using the instruction clock as the TMR0 input source) to delay the interrupts as long as possible. In this con guration, the delay is one sixty-four-thousandth of the
I/O WITH INTERRUPTS
instruction clock. For a PIC microcontroller running at 4 MHz, this works out to an interrupt interval of 16 times per second. I used the prescaler on this application because it simpli ed the Count variable s operation. By using the prescaler for TMR0 in this application, I am not indicating that I feel that the watchdog timer should not be used with this application. If the eye were used for indicating the health of a larger circuit, I would presume that the watchdog timer would be used to indicate if the PIC microcontroller has had a problem in its execution. In this case, the prescaler could be assigned to the watchdog timer, and the Count variable could be increased to 16 bits to perform the same function. Use of the Count variable is a result of the maximum delay being put on TMR0 as not being acceptable for the application. With the 1/16-s maximum delay, I found movement of the eye to be somewhat manic. By placing the Count variable and counting down from 2, I have delayed the operation to something reasonable. For PIC microcontrollers that are clocked with higher frequencies, this variable can be given a higher value to maintain the speed of the eye going back and forth. In addition, if the prescaler is to be used with the watchdog timer, then Count could be used to increase the number of times TMR0 over ows before the eye s position is updated. I originally used the prescaler set to the largest value to minimize the impact the interrupt handler had on the mainline code. Eliminating the prescaler input will result in fewer instructions available to the mainline code for system monitoring.
TMR0Int: SIMULATING INPUT PIN INTERRUPT WITH TIMER PIN INPUT
Some time ago a question came up on the PICList asking whether or not TMR0 could be used as an interrupt input pin if it were set up in such a way that the next transition would cause an over ow condition and request that the interrupt be handled. I discovered that it is indeed is possible to use TMR0 as an interrupt input pin. Using TMR0 in this fashion is something that could be very desirable in the cases where no more interrupt source pins are left available or if a low-end PIC microcontroller is being used, and rather than polling an input, a latch (such as TMR0) could be used to detect a transition. This experiment shows how TMR0 can be set up to request an interrupt after the rst incoming data transition. The circuit is quite simple, as you can see in the schematic in Fig. 20.27 (the bill of materials is listed in Table 20.12) and the breadboard assembly drawing in Fig. 20.28. The code is also very simple and is known as TMR0Int and can be found in the code\TMR0Int folder.
title TMR0Int - Treat TMR0 Input like an Interrupt Input ; ; This Application uses the TMR0 Input Pin (RA4 in the mid-range ; PIC microcontrollers) as interrupt source. When input changes, ; TMR0 over ows, which causes an interrupt request. ;
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