Circuits & Schematics Microcontrollers Usage: clock - 3

21. A Faster PWM-Based DAC
    Circuits Microcontrollers Usage Texas Instruments MSP430F5132
    .. R C ≥ 16×T. Some practical numbers: low-power microprocessors often use a crystal oscillator of 32768 Hz, and this clock signal is used for the PWM block. With 6-bit PWM, the period T is 64/32768 ≈ 2 ms, necessitating a time ...
    14-03-2017

22. AVR takes under 1µs to process quadrature encoder
    Circuits Microcontrollers Usage
    .. and R12 for the new and old states R24 and R25 for position transducer To calculate the current position requires only one clock cycle. The downside is that the position can only have 65536 values. You can determine the position using 3 or ...
    25-05-2016

23. Facilitate oscilloscope debug of small microcontroller systems
    Circuits Measurement Microcontrollers Usage
    .. An 8051 version is shown below. The routine uses no RAM; it uses R7 only. Execution time is 76 µs for a standard 12-clock 12 MHz 8051 core (including the call). ;**************************************************************** ;* * ...
    20-05-2015
24. One-chip 11×10 LED matrix
    Circuits Microcontrollers Usage Light PIC16F688
    .. functions to draw different things, but settled on the current marquee app. It uses a simple bitmapped font to render a clock-like demo text onscreen and scrolls it at a random vertical position. while this demo only uses numbers and ...
    29-05-2014
25. Read 10 or more switches using only two I/O pins of a microcontroller
    Circuits Microcontrollers Usage
    .. (a cascadable decoded 1-of-10 Johnson counter) for reliable operation should an EMI or ESD event occur that could falsely clock the counter, or you can use the circuit shown in Figure 2 and retain the two-pin feature. The diodes isolate ...
    11-03-2014
26. Circuit maximizes pulse-width-modulated DAC throughput
    Circuits Microcontrollers Usage
    .. 1 to implement a 10V 10-bit DAC with a throughput of 20 kHz. A dsPIC30F4011 microcontroller (not shown) is operated at a clock frequency of 96 MHz to generate the capture signals OC 1 and OC 4 . Clock/4 is fed to an internal 16-bit timer ...
    24-12-2013
27. A Generic Optimized 16-bit LCD Adaptor for the Arduino. Part 2 - Software
    Circuits Interfaces MCU Open-Source Platforms Microcontrollers Usage Arduino
    .. hi8) { // this is equivalent to : // *reinterpret_cast volatile uint8_t * (0x8100 | lo8)=hi8; // this method costs 5 clock cycles __asm volatile( ldi r27,0x81 n t mov r26,%0 n t st X,%1 n t :: d (lo8), d (hi8) : r26, r27); } In AVR ...
    05-10-2013
28. 125 kHz RFID Tag Reader
    Circuits Security Wireless Microcontrollers Usage
    .. Fuse: 0x1F and Low Fuse: 0x7A .These settings set the ATtiny13 to work with the internal 9.6 MHz oscillator. The System clock divided by 8 function is disabled. The firmware v1.00 is 1024 bytes and it occupies the 100% of the Flash ...
    31-05-2013
29. Connect a 4×3 matrix keyboard to a microcontroller using two I/O pins
    Circuits Interfaces Microcontrollers Usage
    .. One CD4017 is used to control the keyboard rows, while the other is used to control the columns. The MCU generates a clock signal and feeds it to the counter IC controlling the columns. Initially, the 0th output of the column counter ...
    20-05-2013
30. AVR frequency meter - from 1Hz to 10MHz
    Circuits Measurement Microcontrollers Usage Atmel ATtiny2313
    .. I put in the attachment. Figure 2. AVR frequency meter Schematic Diagram Resolution vs accuracy Accuracy depends on the clock source with which meter is fed. The code itself can occasionally add one pulse at very high frequencies, but it ...
    17-05-2013

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