Microcontrollers in practice by M Mitescu; I Susnea

By M Mitescu; I Susnea

"Stressing universal features and actual functions of the main used microcontrollers, this sensible advisor presents readers with hands-on wisdom of ways to enforce 3 households of microcontrollers (HC11, AVR, and 8051). not like the remainder of the sea of literature on person chips, Microcontrollers in perform provides side-by-side comparisons and an outline that treats the structures as resources Read more...

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A typical RS422/RS485 circuit is SN 75176. The functional block diagram of this circuit is shown in Fig. 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.

In practice, these limits are often exceeded, but the overall reliability of the communication system drops. For longer distances, and higher communication speed, a different interface is required. The interfaces RS422 and RS485 use two conductors to transmit each digital signal, the logic levels being defined by the relative difference of potential between the two conductors. The transmitter’s line driver controls the voltage levels on the two conductors, so that the difference of potential between them is positive for logic 1 and negative for logic 0, as illustrated in Fig.

13 for the detailed description of an implementation of this protocol, used to interrogate a number of addressable sensors. 1 What is the error contained in the interrupt service routine for the reception of characters on SCI for HC11 listed below? SCI_ISR SCIERR LDAA ANDA BNE SCSR #$0E SCIERR LDAA STAA INC RTI INC RTI SCDR SCIRB QSCI QSCIERR ;Isolate error flags ;if error, inform the main ;program ;get character ;save it in a buffer ;true QSCI ;return from interrupt ;true error flag Solution The SCI reception interrupt of HC11 is generated when (RIE = 1) AND ((RDRF = 1) OR (OR = 1)), i.

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