Prescaler, why we need? It also can be used for counter to skip certain number of microcontroller clock ticks. AVR microcontroller allows prescaling or skipping number of 8, 64, , You could see if counter count up to 15, then you can able to blink LED at every second. Timer in compare mode or to say CTC mode, instead of counting until overflow occurs.
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USART is most important and widely used peripheral while developing microcontroller based embedded systems.
USART is not only use for the purpose of communication but it can also be useful while debugging. Since there is no display unit on microcontroller. The serial protocol is created many years ago. It was used by teletypes and terminals. The serial protocol used 2-wire, one to transmit data and other to receive data. In this case we only need to specify the USART which clock speed we want to use this is nothing but baud rate.
The data will transfer at BAUD rate. This is similar to UART operation. In this tutorial instead of just putting all the code together in the main function. We just have to copy the functions and call them as and when needed. To calculate those values there are two ways, one is to read the table provided in the datasheet in USART section near the end or use little formula that was used to generate those value present in datasheet.
These bits are protocol specific. This is where we configure data bit length, parity check and number of stop bits. We recommend reader to leer with datasheet and find out more. If new data comes in,the previous one will be lost so the point is that wait until the RXC bit no.
It does this by setting a bit UDRE bit no. We can already sent data using the serial port. If you have any question then please feel free to drop comment.
دیتاشیت فارسی ATmega32
بایگانی برچسبها: دیتا شیت فارسی میکروکنترلر ATMEGA 32