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The processor interface consists of an 8-bit bi-directional bus for data, status, and control word transfers. The board also contains one serial RS-232 I/O port that is available to the user. The heart of the serial I/O port is the 8251 USART integrated circuit. On-board circuitry allows the user to choose a serial transmission speed between 110 baud and 9600 baud controlled by an on-board baud rate generator. Provisions are also available for the speed to be controlled by an external clock. Jumper areas have been provided to allow the user to choose whether the serial port will be configured as DCE or DTE.
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This page was last modified on 04/13/2014