By John B. Peatman
Coin-Cell-Powered Embedded layout is a school textual content for junior/senior laptop engineering scholars and for training engineers. The booklet develops low-power layout innovations utilizing a Microchip know-how PIC18LF4321 nanoWatt TechnologyTM common function microcontroller.
A sequence of template courses fosters code improvement in C for either the amateur and the skilled programmer, compiled with Microchip Technologys unfastened model in their C18 compiler. The reasonably cheap Qwik&Low board proven at the publication disguise serves as a goal method and contains QwikBug, a integrated debugging interface requiring just a serial cable or a USB-to-serial adapter to a computer.
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Extra resources for Coin-Cell-Powered Embedded Design
Each time the 16-bit TMR1H:TMR1L counter overflows, the TMR1IF flag in the PIR1 register is set and, with the initialization shown, a low-priority interrupt occurs. The chip, which had been asleep, awakens and the low-priority interrupt service routine is executed. , 4-ms minimum or some power of two greater than this). • Does so with the much larger error specification of ±14%. • Does not support fast counting as a side benefit. 2 μA. c program of Figure 7-6 is used to exit from the while loop.
X y z is reinterpreted as ° (degree symbol for temperature) A B C ... RC2 ^= 1; // BlinkAlive(); // Time(); // Pushbutton(); // UpdateLCD(); // Sleep(); // Nop(); } } Initialize everything Toggle pin, for measuring loop time Blink "Alive" LED Display seconds Display pushbutton count Update LCD Sleep, letting watchdog timer wake up chip /******************************* * Initial * * This function performs all initializations of variables and registers. c) // Initialize count of pushbutton presses "); // // // // // Initialize to unpressed pushbutton state Blink immediately Enable watchdog timer Display initial "PRESS PB" message Reinitialize LCDSTRING } /******************************* * BlinkAlive * * This function briefly blinks the LED every four seconds.
A) Describe the program flow when the chip is asleep and a Timer3 interrupt occurs. b) Describe the program flow when the chip is asleep and a Timer1 interrupt occurs. 8-bit counter PROBLEMS Overflow The addition of LoopTime, HiPriISR and LoPriISR function prototypes. The addition of the Interrupt vectors section. The creation of the LoPriISR and HiPriISR functions. The initialization of the Timer1 oscillator, Timer1, and Timer3 to run and to produce interrupts. • The replacement of the Sleep macro in the main loop with the call of a LoopTime function.
Coin-Cell-Powered Embedded Design by John B. Peatman