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~National ~ Semiconductor NS16450, INS8250A, NS16C450, INS82C50A Universal Asynchronous Receiver/Transmitter General Description Each of these parts function as a serial data input! output interface in a microcomputer system. The system software determines the functional configuration of the UART via a TRI-STATE@ 8-bit bidirectional data bus. The UART 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 the UART at any time during the functional operation. Status information reported includes the type and condition of the transfer operations being performed by the UART, as well as any error conditions (parity, overrun, framing, or break interrupt). The UART includes a programmable baud rate generator that is capable of dividing the timing reference clock input by divisors of 1 to (216 -1), and producing a 16 x clock for driving the internal transmitter logic. Provisions are also included to use this 16 x clock to drive the receiver logic. The UART includes a 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 NS16450 is an improved specification version of the INS8250A Universal Asynchronous Receiver/Transmitter (UART). The improved specifications ensure compatibility with the NS32032 and other state-of-the-art CPUs. Functionally, the NS16450 is equivalent to the INS8250A. The UART is fabricated using National Semiconductor's advanced scaled N-channel silicon-gate MOS process, XMOS. The NS16C450 and INS82C50A are functionally equivalent to their XMOS counterparts, except that they are CMOS parts. Features • Easily interfaces to most popular microprocessors. • Adds or deletes standard asynchronous communication bits (start, stop, and parity) to or from serial data stream. • Holding and shift registers eliminate the need for precise synchronization between the CPU and the serial data. • Independently controlled transmit, receive, line status, and data set interrupts. • Programmable baud generator allows division of any input clock by 1 to (216 - 1) and generates the internal 16 x clock. • Independent receiver clock input. • 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 %-, or 2-stop bit generation - Baud generation (DC to 56k baud). • False start bit detection. • Complete status reporting capabilities. • TRI-STATE TTL drive capabilities for bidirectional data bus and control bus. • Line break generation and detection. • Internal diagnostic capabilities: - Loopback controls for communications link fault isolation - Break, parity, overrun, framing error simulation. • Fully prioritized interrupt system controls. z (f) .... Q) .... C1I C) ...... Z ~ I\) C1I ~ ...... Z (f) .... Q) o .... ~ ::::: z (f) CD I\) o (II ~ Connection Diagram NS .... sa INSIZ&IA NSIIC4iII INS8ZClltA TO RS·232 INTERFACE "0" "1" TL/C/8401-1 4-19
~ &I) o N m Z ::::: o &I) 'Of' o co .,.. en z ;C o &I) N m Z ::::: ~ 'Of' CO .,.. en z 1.0 ABSOLUTE MAXIMUM RATINGS 2.0 DC ELECTRICAL CHARACTERISTICS 3.0 AC ELECTRICAL CHARACTERISTICS 4.0 TIMING WAVEFORMS 5.0 BLOCK DIAGRAM 6.0 PIN DESCRIPTIONS 6.1 Input Signals 6.2 Output Signals 6.3 Input/Out Signals 7.0 CONNECTION DIAGRAMS Table of Contents 8.0 REGISTERS 8.1 Line Control Registers 8.2 Typical Clock Circuits 8.3 Programmable Baud Generator 8.4 Line Status Register 8.5 Interrupt Identification Register 8.6 Interrupt Enable Register 8.7 Modem Control Register 8.8 Modem Status Register 8.9 Scratchpad Register 9.0 TYPICAL APPLICATIONS 10.0 ORDERING INFORMATION 11.0 RELIABILITY INFORMATION 4-20
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~ National ~ Semiconductor 400014 R
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TRADEMARKS Following is the most cu
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II) c ~ ~National ~ ~ Semiconductor
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Table of Contents (Continued) Secti
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Alpha-Numeric Index(continUed) DS36
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Section 1 Local Area Networks IEEE
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~National ~ Semiconductor DP8390C/N
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3.0 Functional Description (Continu
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5.0 Pin Descriptions (Continued) BU
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6.0 Direct Memory Access Control (D
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7.0 Packet Reception (Continued) Re
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8.0 Packet Transmission (Continued)
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10.0 Internal Registers (Continued)
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12.0 Loopback Diagnostics (Continue
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13.0 Bus Arbitration and Timing The
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13.0 Bus Arbitration and Timing (Co
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15.0 Switching Characteristics AC S
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15.0 Switching Characteristics (Con
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AC Timing Test Conditions Input Pul
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2.0 Block Diagram COL CRS PROTOCOL
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4.0 Transmit/Receive Packet Encapsu
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5.0 Pin Descriptions (Continued) BU
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7.0 Packet Reception (Continued) fo
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7.0 Packet Reception (Continued) Er
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9.0 Remote DMA The Remote DMA chann
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11.0 Initialization Procedures (Con
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15.0 Switching Characteristics AC S
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AC Timing Test Conditions Input Pul
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2.0 Block Diagram TRANSCEIVER CABLE
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PCC Connection Diagram 39.0. 39.0.
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6.0 Absolute Maximum Ratings Recomm
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9.0 Timing and Load Diagrams (Conti
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2.0 Block Diagram COAX CABLE r ____
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6.0 Absolute Maximum Ratings (Note
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I: • • • • • • Interrup
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PAL20LB Decode and DMA Interface Lo
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~ U16/8 R1 R1,R2=4.7k.o. Note: For
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Although Cheapernet is intended for
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The transmitted packet from the SNI
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Truth Table for Various Collision D
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CHEAPERNET APPLICATION WITH THE DP8
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DP8390 Network Interface Controller
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ping between the received address a
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If the current local DMA address ev
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6.2 Dual Port Memory One popular me
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StarLAN With The DP839EB Evaluation
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SUPPORTING DOCUMENTS The following
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Pulse Transformer U3 .----. j " "P>
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ELECTROSTATIC DISCHARGE TEST (ESD)
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Section 2 Contents DP8340INS32440 I
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.. 0 C'I C") en .... z 0 C") GO Go
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~ 'OIl' N CO) (J) Z .... o 'OIl' CO
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Timing Characteristics Oscillator F
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Timing Waveforms (Continued) TA REG
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.. ... ~ ~National ~ ~ Semiconduc
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Detailed Functional Pin Description
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Message Format (Continued) DATA REC
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Timing Characteristics (Notes 2, 6,
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Timing Waveforms (Continued) 4T±(T
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Typical Applications (Continued) +5
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Timing Characteristics (Continued)
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Functional Timing Waveforms (Contin
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Typical Applications (Continued) DA
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Absolute Maximum Ratings (Note 1) I
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MUX~ __________________ The BIPLAN
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An EPROM implementation was selecte
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MASTER MUL TIPLEXING/DE-MUL TIPLEXI
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AN·496 '" 0, '" (U17/ (U23/6) TO 5
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AN-496 t W19 ~ J2-43 I' [; 0 J2-42
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AN·496
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DP8342/DP8343 HIGH SPEED INTERFACE
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2.0 Connection Diagram A13- 12 A12-
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3.0 Pin Descriptions (Continued) Si
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~ ~ 4.0 Electrical Specifications (
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4.0 Electrical Specifications (Cont
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5.0 Instruction Set Overview (Conti
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6.0 Instruction Set Reference (Cont
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~ C') 6.0 Instruction Set Reference
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! 6.0 Instruction Set Reference (Co
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~ ~ 6.0 Instruction Set Reference (
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7.0 CPU Registers (Continued) BIT I
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7.0 CPU Registers (Continued) BIRO
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7.0 CPU Registers (Continued) 76543
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7.0 CPU Registers (Continued) BIT D
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7.0 CPU Registers (Continued) BIT D
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8.0 Remote Interface and Arbitratio
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~ ~ HASM state TCU state eLK-OUT RE
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~ 01 CO RASM stat. TCU stat. CLK-OU
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~ 8l HASM stat. TCU stat. CU- C» b
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10.0 Transceiver (Continued) (a) 32
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10.0 Transceiver (Continued) TABLE
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10.0 Transceiver (Continued) dotted
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10.0 Transceiver (Continued) TABLE
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10.0 Transceiver (Continued) {also
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Decoding Bit Fields with the JRMK I
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Receiver Interrupts/Flags for the D
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****************DA ISR*************
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"Interrupts"-A Powerful Tool of the
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TABLE II. (lCR) Interrupt Mask Bits
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Running the DP8344 with wait states
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» z I U'I Q 01:00 INSTRUCTION ADDR
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WHY EPROM SOFT-LOAD? In a stand-alo
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RESET ~. Timing at Beginning of Ins
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.. I CRYSTAL ~~~.~ I UP TO 64K OP83
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Page 386 and 387: 00044 F90a :J- 226 Z • 227 MOVE A
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Page 390 and 391: Section 3 ISDN Components
Page 392 and 393: Introduction To National Semiconduc
Page 394 and 395: NSC Solutions for Layers 2 and 3 Na
Page 396 and 397: NSC Solutions: Systems Level Basic
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Page 400 and 401: ~National ~ Semiconductor PRELIMINA
Page 402 and 403: ISDN DEFINITIONS "B" Channel, or DS
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Page 407 and 408: Section 4 Contents INS8250/INS8250-
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Page 466 and 467: NS16550A E-J r-o ..... IRQ4 ICU CPU
Page 468 and 469: TITLE 550APP.ASM - NS16550A INITIAL
Page 470 and 471: 3.0 Board to Board Communications w
Page 472 and 473: DIAPPS.ASM Flow Chart l> z • ~ CO
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» z I "" CD RDAI: DISABLE IRTS, SE
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COMPARE: SET UP COMPARE BUffER POIN
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.set iCu imsk,lO *aO • set icu -c
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holdloop: nop # br hold loop # # #*
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# msint: save [rO,rl,r2,r3] # movd
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#3/30/B7••••• D2APPS.ASM
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# #*************************** 1655
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A Comparison of the I NS8250, NS 16
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cessed (see Figure 4), The output o
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AC Electrical Characteristics T A =
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~National ~ Semiconductor \ J micro
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1.0 Absolute Maximum Ratings 2.0 Op
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4.0 AC Electrical Characteristics (
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5.0 Timing Waveforms (Continued) ii
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6.0 Connection Diagrams Dual-In-Lln
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8.0 Block Diagram CPU INTERFACE INT
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9.0 Registers (Continued) Bit three
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Section 5 Contents MM74HC942 300 Ba
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Absolute Maximum Ratings (Notes 1 &
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fj ::z:: ~ :::IE :::IE ~ ,---------
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Applications Information (Continued
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Absolute Maximum Ratings (Notes 1 &
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Description of Pin Functions Pin No
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Electrical Characteristics Unless o
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C'I 5 Pin Descriptions (Continued)
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IlAV22 RXIN LOCAL OSCILLATOR (L.O.)
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Functional Description (Continued)
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Functional Description (Continued)
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Absolute Maximum Ratings* If Milita
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Electrical Characteristics unless o
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Functional Description* (Continued)
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,...A212AT RECEIVE FILTER p--------
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TABLE III. Remote Digital Loopback
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Section 6 Transmission Line Drivers
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~National ~ Semiconductor Transmiss
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~National ~ Semiconductor OS 1488 Q
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J?'A National ~ Semiconductor OS 14
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~National ~ Semiconductor DS26C31 C
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~National ~ Semiconductor DS26C32C
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~National ~ Semiconductor DS34C86 Q
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~National ~ Semiconductor PRELIMINA
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~National ~ Semiconductor DS1692/DS
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~National ~ Semiconductor DS75150 D
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~National ~ Semiconductor DS75176A/
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~National ~ Semiconductor DS8922/22
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~National ~ Semiconductor DS96172/~
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~National ~ Semiconductor DS961771
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~National ~ Semiconductor DS9637 AI
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• I .----------------------------
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Section 7 Physical Dimensions
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~National ~ Semiconductor All dimen
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NS Package N16A N16A(REV E) 0.092 X
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t-------------I:..':::~"':I'-------
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0.11M-0.118 (2.642-2.9971 .. ••
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NOTES
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~National ~ Semiconductor Bookshelf
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RELIABILITY HANDBOOK-1986 Reliabili
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NATIONAL SEMICONDUCTOR CORPORATION
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NATIONAL SEMICONDUCTOR CORPORATION
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~ National ~ Semiconductor
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