Communications: electrical – Digital comparator systems
Patent
1975-02-18
1976-08-17
Yusko, Donald J.
Communications: electrical
Digital comparator systems
178 58R, 179 15BA, 3401725, G06F 300, H04J 300, H04Q 500
Patent
active
039757129
ABSTRACT:
An integrated circuit asynchronous communications interface adapter (ACIA) includes circuitry on a semiconductor chip for interfacing with a bidirectional data bus of a microcomputer. Bus interface circuitry on the ACIA chip controls data transfer between the microcomputer data bus and a transmit data register and a read data register on the ACIA chip. Transmitting circuitry on the ACIA chip converts data from a parallel format to a serial format. Receiving circuitry on the ACIA chip accepts data in a serial format and converts it to a parallel format prior to transferring it to a receive data register. A control register controls data transfer throughout the ACIA chip. A status register on the ACIA chip may be interrogated under program control to determine the status of registers and/or correctness of data format, status of interrupt logic or modem control lines. Several Modem and/or peripheral control functions, including a "clear-to-send" input, a "request-to-send" output and a "data-carrier-loss detected" input are provided by circuitry on the ACIA chip.
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Hepworth Edward C.
Means Rodney J.
Peddle Charles I.
Hoffman Charles R.
Motorola Inc.
Weiss Harry M.
Yusko Donald J.
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