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[Previous] [Up] [Top] [Contents] [Back]Chapter 3 Programming Considerations
The MC68153 Bus Interrupter Module (BIM) is designed to serve as an interrupt requester for peripheral devices in a microcomputer system. Up to four independent devices can be interfaced to the system bus by the MC68153. Intended for asynchronous master/slave bus operation, the BIM is compatible with VMEbus. An interrupt request from any device is routed to the MC68153, and the BIM handles all interface to the system bus. It generates a bus interrupt request as a result of the device interrupt request. When the system interrupt handler responds with an interrupt acknowledge cycle, the MC68153 can answer supplying an interrupt vector and handling all timing.
Four 8-bit vector registers contain status/address information and supply a byte vector in response to an interrupt acknowledge cycle for the corresponding interrupt source. Four other 8 bit control registers contain information that oversees operation of the interrupt circuitry. The control information is programmable and includes interrupt request level and interrupt enable and disable. Also contained in the control register are flag bits. These flags are useful for task coordination, resource management, and interprocessor communication.
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