By John B. Peatman
Coin-Cell-Powered Embedded layout is a school textual content for junior/senior machine engineering scholars and for training engineers. The ebook develops low-power layout strategies utilizing a Microchip expertise PIC18LF4321 nanoWatt TechnologyTM common function microcontroller.
A sequence of template courses fosters code improvement in C for either the beginner and the skilled programmer, compiled with Microchip Technologys unfastened model in their C18 compiler. The reasonably cheap Qwik&Low board proven at the booklet disguise serves as a aim procedure 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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Additional info for Coin-Cell-Powered Embedded Design
It assumes * Fosc = 4 MHz. For a different oscillator frequency, use Figure 6-3c to * change BRGH and SPBRG appropriately. 4 UART INITIALIZATION The UART module in the MCU must be initialized before it can be used. The baud rate settings of Figure 6-3c for FOSC = 4 MHz are reflected in the register contents of Figure 6-5. c) Even though QwikBug has already initialized the UART in order to download a user program, run it, and aid in debugging it, QwikBug has done so with FOSC = 8 MHz. For a user program operating with FOSC = 4 MHz, the baud rate settings must be reinitialized to the settings shown in Figure 6-5 in order to have the PC accept the MCU output correctly at 19,200 baud.
C ****************** * * Use Fosc = 4 MHz for Fcpu = Fosc/4 = 1 MHz. * Sleep for 16 ms (nominal), using watchdog timeout for wakeup. * Toggle RC2 output every 16 milliseconds for measuring looptime with scope. * Blink LED on RD4 for 16 ms every four seconds. * Post PRESS PB message on LCD until first pushbutton push. * Increment LCD's CHAR0:CHAR1 every second. * Increment LCD's CHAR3:CHAR4 for each pushbutton press. 5678 Numbers: Upper-case letters: Recognized symbols: 0123456789 A B C ... +−*/<>^ (a) Characters displayed in response to their ASCII codes.
Then a number between 0 and 255 is converted to ASCII-coded digits two ways: * ASCII forms each digit by successive subtractions (up to 98 cycles). * ASCIID forms each digit via two divisions (up to 357 cycles). * For each one, the result is displayed on the LCD. * The execution time (cycles)is displayed on the PC * Execution stops with a sleep command. * * Start and Stop functions are added to measure the execution time of the * code between them. The Send function sends the time to the PC monitor.