The 16-Bit Timer/Counter1 The 90S8515 was used for the documentation. Other chips might have a somewhat different timer. The 16-bit Timer/Counter1 can select its clock source from CK, pre-scaled CK, or an external pin. In addition it can be stopped (no clock). The different status flags (overflow, compare match and capture event) and control signals [...]
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AVR Internal Hardware TIMER0
The 8-Bit Timer/Counter0 The 90S8515 was used for this example. Other chips might have a somewhat different timer. The 8-bit Timer/Counter0 can select its clock source from CK, pre-scaled CK, or an external pin. In addition it can be stopped (no clock). The overflow status flag is found in the Timer/Counter Interrupt Flag Register – [...]
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keypad on AVR microcontroler
Action Configure the GETKBD() function and tell which port to use. Syntax CONFIG KBD = PORTx , DEBOUNCE = value [, DELAY = value] Remarks PORTx The name of the PORT to use such as PORTB or PORTD. DEBOUNCE By default the debounce value is 20. A higher value might be needed. The maximum is [...]
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Using the SPI protocol
General description of the SPI The SPI allows high-speed synchronous data transfer between the AVR and peripheral devices or between several AVR devices. On most parts the SPI has a second purpose where it is used for In System Programming (ISP). The interconnection between two SPI devices always happens between a master device and a [...]
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EM4095 RFID Reader
Introduction RFID technology is an exciting technology. The EM4095 chip allows us to create a reader with little code or processor resources. A complete KIT is available from the web shop at www.mcselec.com This topic describes the reference design. The data sheets you can download from: EM4095 (chip) , EM4102 (transponder) The circuit As you [...]
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Using the UART
UART A Universal Asynchronous Receiver and Transmitter (UART) can be used to send and receive data between two devices. More specific these devices can be PC-to-PC, PC-to-micro controller and micro controller-to-micro controller. The UART communicates using TTL voltages +5V and 0V or LVTTL depending on your micro controllers VCC voltage. If you wish to connect [...]
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Using the I2C protocol
I2C bus I2C bus is an abbreviation for Inter Integrated Circuit bus. It is also known as IIC and I2C. I2C is a serial and synchronous bus protocol. In standard applications hardware and timing are often the same. The way data is treated on the I2C bus is to be defined by the manufacturer of [...]
