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Home » NEWEST Products » New by Manufacturer » Western Design Center » Interface Adapters - Western Design Center
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Western Design Center

Western Design Center Interface Adapters

Western Design Center (WDC) offers various interface adapters that are easily implemented, program controlled interfaces between 8-bit microprocessor based systems and serial communication data sets and modems. WDC offers Asynchronous Communications Interface Adapter (ACIA), Peripheral Interface Adapter (PIA), and Versatile Interface Adapters (VIA). Each is designed to help interface between 8-bit microprocessors and various peripheral devices.

Western Design Center (WDC) W65C51N CMOS Asynchronous Communications Interface Adapter (ACIA) provides an easily implemented, program controlled interface between 8-bit microprocessor based systems and serial communication data sets and modems. The ACIA has an internal baud rate generator. This feature eliminates the need for multiple component support circuits, a crystal being the only other part required. The Transmitter baud rate can be selected under program control to be either 1 of 15 different rates from 50 to 19,200 baud, or at 1/16 times an external clock rate. The Receiver baud rate may be selected under program control to be either the Transmitter rate or at 1/16 times the external clock rate. The ACIA has programmable word lengths of 5, 6, 7 or 8 bits; even, odd or no parity (Mark Parity only for Transmitter); 1, 1½ or 2 bit stops. The ACIA is designed for maximum-programmed control from the microprocessor (MPU) to simplify hardware implementation. Three separate registers permit the MPU to easily select the W65C51N operating modes and data checking parameters and determine operational status.

Features
  • Low power CMOS N-well silicon gate technology
  • Replacement for CMD / GTE / Harris / MOS Technology / GE /
    RCA / Synertek / Motorola / Rockwell R6551, G65SC51, 65C51,
    6551, CPD65C51, 6850
  • Full duplex operation with buffered receiver and transmitter
  • Data set/modem control functions
  • Internal baud rate generator with 15 programmable baud rates
    (50 to 19,200)
  • Program-selectable internally or externally controlled receiver rate
  • Programmable word lengths, number of stop bits and parity bit
    generation and detection

  • Programmable interrupt control
  • Program reset
  • Program-selectable serial echo mode
  • Two chip selects
  • 5.0 VDC ± 5% supply requirements
  • 28 pin plastic DIP package
  • 32 pin LQFP package
  • Full TTL compatibility
  • Compatible with 65xx and 68xx microprocessors
 
Block Diagram
Block Diagram

Western Design Center (WDC) W65C21 Peripheral Interface Adapter (PIA) are very flexible adapters for use with WDC's 65xx, 68xx, and other 8-bit microprocessor families. The W65C21 provides programmed microprocessor control of up to two peripheral devices (Port A and Port B). Peripheral device control is accomplished through two 8-bit bidirectional I/O Ports, with individually designed Data Direction Registers. The Data Direction Registers provide selection of data flow direction (input or output) at each respective I/O Port. Data flow direction may be selected on a line-by-line basis with intermixed input and output lines within the same port. The "handshake" interrupt control feature is provided by four peripheral control lines. This capability provides enhances control over data transfer functions between the microprocessor and peripheral devices, as well as bidirectional data transfer between W65C21 Peripheral Interface Adapters in multiprocessor systems.

Western Design Center (WDC) W65C21 Peripheral Interface Adapter (PIA)
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Features
  • 2 x 8−bit bidirectional I/O ports with individual data direction control
  • Automatic "Handshake" control of data transfers
  • 2 Interrupt outputs with program control
  • Static to 14MHz operation, with high speed Port A, CA2 outputs
  • 40 Pin Plastic Dip and 44 Pin Plastic PLCC versions
  • 5V Power Supply

  • Bus compatible with 14 MHz W65C02S and W65C816S
  • Compatible with the 65xx and 68xx family of microprocessors
  • Replacement for Motorola/Freescale / Rockwell / AMI / MOS
    Technology / MOSTEK / HITACHI / ST Microelectronics / GTE
    / CMD, 6520, 6521, 6820, 6821, PIA′s
 
Block Diagram
Block Diagram

Western Design Center (WDC) W65C22 Versatile Interface Adapters (VIA) are a flexible I/O device for use with the 65xx series microprocessor family. The W65C22 includes functions for programmed control of two peripheral ports (Ports A and B). Two program controlled 8-bit bidirectional peripheral I/O ports allow direct interfacing between the microprocessor and selected peripheral units. Each port has input data latching capability. Two programmable Data Direction Registers (A and B) allow selection of data direction (input or output) on an individual line basis. Also provided are two programmable 16-bit Interval Timer/Counters with latches. Timer 1 may be operated in a One-Shot Interrupt Mode with interrupts on each count to zero, or in a Free-Run Mode with a continuous series of evenly spaced interrupts. Timer 2 functions as both an interval and pulse counter. Serial Data transfers are provided by a serial to parallel/parallel to serial shift register. Application versatility is further increased by various control registers, including an Interrupt Flag Register, an Interrupt Enable Register and two Function Control Registers.

Western Design Center (WDC) W65C22 Versatile Interface Adapters (VIA)
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Features
  • 2 x 8−bit, bi−directional peripheral I/O Ports
  • 2 x 16−bit programmable Interval Timer/Counters
  • Synchronous Serial bi−directional peripheral I/O Port
  • Enhanced "Handshake" feature works with either 8− or 8/16−bit systems
  • Latched Input/Output Registers on both I/O Ports
  • Programmable Data Direction Registers

  • TTL compatible I/O peripheral lines
  • 1.8V (W65C22S only) − 5V Power Supply
  • Bus compatible with 14 MHz W65C02S and W65C816S
  • Compatible with the 65xx and 68xx family of microprocessors
  • Replacement for Rockwell / GTE / CMD / Synertek / MOS
    Technology NMOS 6522 and CMOS 65C22 VIA's
Block Diagram
Block Diagram
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  • Semiconductors|Integrated Circuits|IC-Interface