Am9519A Universal Interrupt Controller
■The Am9519A Universal Interrupt Controller is a processor support circuit that provides a powerful interrupt structure to increase the efficiency and versatility of microcomputer-based systems. A single Am9519A manages up to eight maskable interrupt request inputs, resolves priorities and supplies up to four bytes of fully programmable response for each interrupt. It uses a simple expansion structure that
allows many units to be cascaded for control of large numbers of interrupts. Several programmable control features are provided to enhance system flexibility and
optimization.
■The Universal Interrupt Controller is designed with a general purpose interface to facilitate its use with a wide range of digital systems, including most popular 8-bit
microprocessors. Since the response bytes are fully programmable, any instruction or vectoning protocol appropriate for the host processor may be used.
■When the Am95l9A controller receives an unmasked interrupt request, it issues a Group Interrupt output to the CPU. When the interrupt is acknowledged, the controller outputs the one-to-four byte response associated with the highest priority unmasked interrupt request. The ability of the CPU to set interrupt requests under software control permits hardware prioritization of software tasks and aids
system diagnostic and maintenance procedures.
●DISTINCTIVE CHARACTERISTICS:
■Eight individually maskable interrupt inputs reduce CPU overhead;
■Unlimited interrupt channel expansion with no extra hardware;
■Programmable 1-byte to 4-byte response provides vector address and message protocol for 8-bit CPUs;
■Rotating and fixed priority resolution logic;
■Software interrupt request capability;
■Common vector and polled mode options;
■Automatic hardware clear of in-service interrupts reduces software overhead;
■Polarity control of interrupt inputs and outputs;
■Reset minimizes software initialization by automatically generating CALL to location zero;
■SMD/DESC qualified.
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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May 1989 |
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Rev, D |
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00147 |
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673 KB |
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