SC26C562 CMOS Dual Universal Serial Communications Controller (CDUSCC)

The Philips Semiconductors SC26C562 Dual Universal Serial Communications Controller (CDUSCC) is a single-chip CMOS-LSI Communications device that provides two independent, multi-protocol, full-duplex receiver/transmitter channels in a single package. It supports bit-oriented and character-oriented (byte count and byte control) synchronous data link controls as well as asynchronous protocols. The SC26C562 Interfaces to synchronous bus MPUs and is capable of program-polled, interrupt driven, block-move or DMA data transfers. The SC26C562 (CDUSCC) is (PIN) hardware and (REGISTER) software compatible with the existing SCN26562 (DUSCC). CDUSCC will automatically configure to the NMOS DUSCC Register map (default mode) on power-up. The operating mode and data format of each channel CAN be programmed independently. Each channel consists of a receiver, a transmitter, a 16-bit multifunction Counter Timer a digital phase-locked loop (DPLL), a parity/CRC generator and checker, and associated control circuits. The two channels share a common bit rate generator (BRG), operating directly from a crystal or an external Clock which provides sixteen common bit rates simultaneously. The operating rate for the receiver and transmitter of each channel CAN be independently selected from the BRG, the DPLL, the Counter Timer or from an external 1X or 16X Clock making the CDUSCC well-suited for dual-speed channel applications. Data rates up to 10 Mbit/s are supported. The transmitter and receiver each contain a sixteen-deep FIFO with appended transmitter command and receiver status bits and a shift Register This permits reading and writing of up to sixteen characters at a time, minimizing the potential of receiver overrun or transmitter underrun, and reducing interrupt or DMA overhead. In addition, a flow control capability is provided to disable a remote transmitter when the FIFO of the local receiving device is full. Two modem control inputs (DCD and CTS) and three modem control outputs (RTS and two general purpose) are provided. Because the modem control inputs and outputs are general purpose in nature, they CAN be optionally programmed for other functions. The SC26C562 CDUSCC is optimized to Interface with processors using a synchronous bus Interface such as the 8086, and iAPX86 family. For systems using an asynchronous bus, such as the 68000 and 68010, refer to the SC68C562 documentation. Refer to the CMOS Dual Universal Serial Communication Controller (CDUSCC) User's Manual for a complete operational description.
By NXP Semiconductors
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