Microcontrollers in practice by M Mitescu; I Susnea

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By M Mitescu; I Susnea

"Stressing universal features and genuine functions of the main used microcontrollers, this sensible consultant offers readers with hands-on wisdom of ways to enforce 3 households of microcontrollers (HC11, AVR, and 8051). in contrast to the remainder of the sea of literature on person chips, Microcontrollers in perform offers side-by-side comparisons and an summary that treats the structures as resources Read more...

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HC11 baud rate select bits SCR2 SCR1 SCR0 Prescaller output is divided by: 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 1 2 4 8 16 32 64 128 32 3 Using the Asynchronous Serial Interface Example Knowing that the oscillator frequency is 8 MHz, and that the output frequency of the baud generator must be 16 times the actual baud rate, determine the value to write in the BAUD register in order to obtain 9600 baud communication speed. Solution The input clock for the prescaler is the system clock E.

NF – Noise Error Flag One of the situations when this error flag is set has been described in Sect. 3. In fact, the reception data line is sampled several times during each Tb interval. NF is set when the samples corresponding to the same interval Tb have different values. 0 = character received without noise 1 = noise detected for the last character received • FE – Framing Error FE is set when a logic zero is detected in the position of the stop bit. 0 = Stop bit detected in the right position 1 = Zero detected instead of a stop bit All error bits are cleared by reading SCSR followed by a read from SCDR.

9. This circuit contains in the same capsule one differential transmitter, and one differential receiver, having individual enable inputs: DE (Driver Enable) active HIGH, and RE\backslash(Receiver Enable) active LOW. When DE = 0, the outputs A, B are in a high impedance status, thus the transmitter is virtually disconnected from the communication line, leaving the control of the line to other similar devices. 3 The Current Loop Interface When the length of the communication line is higher than 1 km, or in harsh industrial environments, where galvanic isolation between the transmitter and the receiver is essential, it is possible to use the interface presented in Fig.

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