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PC16552 MDA, PC165520V, PC16552D

Table of contents:
Info of PC16552 MDA
Info of PC165520V
Info of PC16552D

PC16552 MDA, PC165520V, PC16552D Selling Leads, Datasheet

MFG:NSC Package Cooled:PLCC D/C:94

PC16552 MDA, PC165520V, PC16552D Picture

PC16552 MDA, PC165520V, PC16552D Datasheet download

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Part Number: PC16552 MDA

MFG: NSC

Package Cooled: PLCC

D/C: 94

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PC16552D General Description

The PC16552D is a dual version of the PC16550D Universal Asynchronous Receiver/Transmitter (UART). The two serial channels are completely independent except for a common CPU interface and crystal input. On power-up both channels are functionally identical to the 16450*. Each channel can operate with on-chip transmitter and receiver FIFOs (FIFO mode) to relieve the CPU of excessive software overhead.

In FIFO mode each channel is capable of buffering 16 bytes (plus 3 bits of error data per byte in the RCVR FIFO) of data in both the transmitter and receiver. All the FIFO control logic is on-chip to minimize system overhead and maximize system efficiency.

Signalling for DMA transfers is done through two pins per channel (TXRDY and RXRDY). The RXRDY function is multiplexed on one pin with the OUT 2 and BAUDOUT functions. The CPU can select these functions through a new register (Alternate Function Register).

Each channel performs serial-to-parallel conversion on data characters received from a peripheral device or a MODEM, and parallel-to-serial conversion on data characters received from the CPU. The CPU can read the complete status of each channel at any time. Status information reported includes the type and condition of the transfer operations being performed by the DUART, as well as any error conditions (parity, overrun, framing, or break interrupt).

The DUART includes one programmable baud rate generator for each channel. Each is capable of dividing the clock input by divisors of 1 to (216 b 1), and producing a 16 c clock for driving the internal transmitter logic. Provisions are also included to use this 16 c clock to drive the receiver logic. The DUART has complete MODEM-control capability, and a processor-interrupt system. Interrupts can be programmed to the user's requirements, minimizing the computing required to handle the communications link. The DUART is fabricated using National Semiconductor's advanced M²CMOSTM.

PC16552D Maximum Ratings

Temperature under Bias . . . . . . . . . . . . 0 to +70
Storage Temperature . . . . . . . . . . . -65 to +150
All Input or Output Voltages
with Respect to V_SS. . . . . . . . . . . . . -0.5V to +7.0V
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . .1W
Note: Maximum ratings indicate limits beyond which permanent damage may occur. Continuous operation at these limits is not intended and should be limited to those conditions specified under DC electrical characteristics.

PC16552D Features

` Dual independent UARTs
` Capable of running all existing 16450 and PC16550D software
` After reset, all registers are identical to the 16450 register set
` Read and write cycle times of 84 ns
` In the FIFO mode transmitter and receiver are each buffered with 16-byte FIFOs to reduce the number of interrupts presented to the CPU
` Holding and shift registers in the 16450 Mode eliminate the need for precise synchronization between the CPU and serial data
` Adds or deletes standard asynchronous communication bits (start, stop, and parity) to or from the serial data
` Independently controlled transmit, receive, line status, and data set interrupts
` Programmable baud generators divide any input clock by 1 to (216 b 1) and generate the 16 c clock
` MODEM control functions (CTS, RTS, DSR, DTR, RI, and DCD)
` Fully programmable serial-interface characteristics:
    5-, 6-, 7-, or 8-bit characters
    Even, odd, or no-parity bit generation and detection
    1-, 1(/2-, or 2-stop bit generation
    Baud generation (DC to 1.5M baud) with 16 c clock
` False start bit detection
` Complete status reporting capabilities
` TRI-STATE. TTL drive for the data and control buses
` Line break generation and detection
` Internal diagnostic capabilities:
    Loopback controls for communications link fault isolation
    Break, parity, overrun, framing error simulation
` Full prioritized interrupt system controls

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