-USART. Serial I/O – Programmable Communication Interface. Data Communications. Data communications refers to the ability of one computer to. USART The is a USART (Universal Synchronous Asynchronous Receiver Transmitter) for serial data communication. Interrupt Structure of . The modem control unit handles the modem handshake signals to coordinate the communication between modem and transmit control unit.
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It is also possible to set the device in “break status” low level by a command.
In “asynchronous mode,” this is an output terminal which generates archietcture level”output upon the detection of a “break” character if receiver data contains a “low-level” space between the stop bits of two continuous characters. This is a clock input signal which determines the transfer speed of received data.
UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER
This device also receives serial data from the outside and transmits parallel data to the CPU after conversion. In “asynchronous mode”, it is possible to select the baud rate factor by mode instruction. Ysart is an output terminal for transmitting data from which serial-converted data is sent out.
Data is transmitable if the terminal is at low level. This is an output terminal which indicates that the is ready to accept a transmitted data architeecture.
The terminal controls data transmission if the device is set in “TX Enable” status by a command. As the transmitter is disabled by setting CTS “High” or command, data written before disable will be sent out. Unless the CPU reads a data character before the next one is received completely, the preceding data will be lost.
In “synchronous mode,” the baud rate is the same as the frequency of RXC.
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The terminal will be reset, if RXD is at high level. In “internal synchronous mode. This is an output terminal which indicates that the has transmitted all the characters and had no data character. It is possible to set the status RTS by a command.
A “High” on this input forces the to uzart receiving data characters. After Reset is active, the terminal will be output at low level. Mode instruction is used for setting the function of the This is a terminal whose function changes according to mode.
In such a case, an overrun error flag status word will be set. The device is in “mark status” high level after resetting or during a status when acrhitecture is disabled.
This is bidirectional data bus which receive control words and transmits data from the CPU and sends status words and received data to CPU. It is possible to see the internal status of the by reading a status word. If a status word is read, the terminal will be reset.
This uaart the “active archiitecture input terminal which receives a signal for writing transmit data and control words from the CPU into the This is a terminal which indicates that the contains a character that is ready to READ. The bit configuration of status word is shown in Fig.
CLK signal is used to generate internal device timing. This is the “active low” input terminal which receives a signal for reading receive data and status words from the The bit configuration of mode instruction is shown in Figures 2 and 3. In “external synchronous mode, “this is an input terminal.
It is possible to write a command whenever necessary after writing a mode instruction and sync characters. The functional configuration is programed by usaet. Even if a data is written after disable, that data is not sent out and TXE will be “High”. In “synchronous mode,” the baud rate will be the same as the frequency of TXC.
Command is used for setting the operation of the