DatasheetsPDF.com

INS8257


Part Number INS8257
Manufacturer National Semiconductor
Title Programmable DMA Controller
Description ;; The INS8257 is a Direct Memory Access (DMA) con· troller contained in a standard 40·pin dual·in·line The channel control registers consist o...
Features
• Four
·Channel DMA Controller
• Priority DMA Request Logic ..-a.g::.:s. CD registers (one pair per channel). A status register is also Included, which provides terminal count status
• Channel Inhibit Logic for each channel. The status register also contains a
• Terminal Count and Modulo 128 Out...

File Size 943.71KB
Datasheet INS8257 PDF File








Similar Ai Datasheet

INS8250 : 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 re­ ceived from the CPU. The CPU can read the complete status of the UART. Status information reported includes the type and condition of the transfer operations being per­ formed by the UART, as well as any error conditions (parity, overrun, framing, or break interrupt). The UART includes a programmable baud rate gen.

INS8250-B : 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 re­ ceived from the CPU. The CPU can read the complete status of the UART. Status information reported includes the type and condition of the transfer operations being per­ formed by the UART, as well as any error conditions (parity, overrun, framing, or break interrupt). The UART includes a programmable baud rate gen.

INS8250A : www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Manufacturer www.DataSheet4U.com This Material Copyrighted By Its Respective Man.

INS8251 : Features ii1 The INSB251 is a programmable Universal Synchronous/ • Synchronous and Asynchronous Full Duplex 3 Asynchronous Receiver/Transmitter (USART) chip contained in a standard 2B-pin dual-in-line package_ The Operations • Synchronous Mode Capabilities 3 Q) chip, which is fabricated using N-channel silicon gate technology, functions as a serial data input/output interface in National Semiconductor's NBOBO micro- - Selectable 5- to B-Bit Characters - Internal or External Character Synchronization - Automatic Sync Insertion C" CD computer family. The functional configuration of the INSB251 is programmed by the system software for • Asynchronous Mode Capabilities - Selectable .

INS8253 : The INS8253 is a programmable timer/counter device contained in a standard, 24-pin dual-in-line package. The chip, which is fabricated using N-channel silicon gate technology, provides counting or time-out services in a microcomputer system. The various operating modes and other functional characteristics of thelNS8253 are programmed by the system software. The INS8253 provides three independent 16-bit down counters, each of which is capable of count rates in the range DC to 2MHz. Through software initialization, each counter can be made to operate in anyone of six modes. The modulus and counting system used are also specified by system software. The operating characteristics of any individu.

INS8254 : Features The INSS254 is an LSI device which provides two S-bit ports of peripheral interfacing capability for microcomputer systems. The I/O chip contains two peripheral ports of eight bits each. Each of the I/O pins in the two ports may be defined as an input or an output to provide maximum flexibility. Each port may be read from or written to in a parallel (S-bit byte) mode. To improve efficiency and simplify programming in control-based applications, a single bit of I/O in either port may be set, cleared or read with a single microproCessor instruction. In addition to basic I/O, one of the ports, port A, may be programmed to operate in several types of strobed mode with handshake. Strob.

INS8255 : The INS8255 is a programmable peripheral interface contained in a standard, 4().pin dual·in·line package. The chip, which is fabricated using N·charinel silicon gate technology, functions as a general·purpose parallel input/output interface in National Semiconductor's N8080 microcomputer family. The functional configura· tion of the INS8255 is programmed by the system software so that normally no external logic is required to interface peripheral devices. The INS8255 has three basic modes of operation that can be selected by the system software. In the first mode (Mode 0), the INS8255 provides simple input and outqut operations for three 8·bit ports. Data is simply written to or read from a .

INS8255N : The INS8255 is a programmable peripheral interface contained in a standard, 4().pin dual·in·line package. The chip, which is fabricated using N·charinel silicon gate technology, functions as a general·purpose parallel input/output interface in National Semiconductor's N8080 microcomputer family. The functional configura· tion of the INS8255 is programmed by the system software so that normally no external logic is required to interface peripheral devices. The INS8255 has three basic modes of operation that can be selected by the system software. In the first mode (Mode 0), the INS8255 provides simple input and outqut operations for three 8·bit ports. Data is simply written to or read from a .

INS8259 : The INS8259 is a Programmable Interrupt Controller chip contained in a standard 28-pin dual-in-Iine package_ The chip, which is fabricated using N-channel silicon gate technology, functions as a versatile interrupt management device in a microcomputer system. Each INS8259 resolves interrupt requests from up to eight different sources. These devices can be cascaded to provide interrupt management of up to 64 levels with no other circuitry required. The INS8259 minimizes software and real time overhead when handling multi-level priority interrupts. Its four operating modes allow the device to satisfy diverse system requirements. Features • Performs Priority Control of up to Eight Interrupt Le.




Since 2006. D4U Semicon,
Electronic Components Datasheet Search Site. (Privacy Policy & Contact)