Abstract: A controller 12 has an I/O crossover switching network 14, an optional I/O network expansion 16, a plurality of serial I/O shifters 18, a clock generator 20 and I/O control logic 22. The I/O crossover-switching network 14 is also referred to as an I/O multiplexer. Serial data may be transferred between a serial I/O shifter and an external device by way of a dedicated serial data pin (SDATA) 24 or an optional alternate pathway 26 which uses one of a plurality of parallel pins 28. The optional alternate pathway 26 can be used when pins 28 are unavailable or to reduce the number of pins on the device 12. The controller is shown to communicate with an external device 30 also having parallel pins 32. While a single device 30 is shown, the external device 30 can be any number of a plurality of devices having serial and parallel signal pathways that is controlled by the microprocessor 10 of the present invention.

Abstract: An engine control system comprising a host processor in operative communication with a data bus and a plurality of peripheral devices for communicating engine operating parameters. Each of the peripheral devices include a first and second transaction register for storing communication parameters for each of the corresponding plurality of peripheral devices. The control system also includes a queued port rate register (QRR) including a memory unit in operative communication with the plurality of peripheral devices for storing data for transmission to the plurality of peripheral devices in accordance with the first and second transaction registers. The system further includes a peripheral counter in operative communication with each of the plurality of peripheral devices. The peripheral counter is adapted to interrogate each of the plurality of peripheral devices and, when data has been written to one of the peripheral devices, update the peripheral device according to the memory unit data.

Abstract: A controller 12 has an I/O crossover switching network 14, an optional I/O network expansion 16, a plurality of serial I/O shifters 18, a clock generator 20 and I/O control logic 22. The I/O crossover-switching network 14 is also referred to as an I/O multiplexer. Serial data may be transferred between a serial I/O shifter and an external device by way of a dedicated serial data pin (SDATA) 24 or an optional alternate pathway 26 which uses one of a plurality of parallel pins 28. The optional alternate pathway 26 can be used when pins 28 are unavailable or to reduce the number of pins on the device 12. The controller is shown to communicate with an external device 30 also having parallel pins 32. While a single device 30 is shown, the external device 30 can be any number of a plurality of devices having serial and parallel signal pathways that is controlled by the microprocessor 10 of the present invention.

Abstract: Serial communication circuitry (10) having multiple queues (11-14) for use in a data processing system (95). Each queue (11-14) has multiple entries (52). Serial transfers from the multiple queues (11-14) are carried out under the control of global parameters (e.g. 205, 209), per-queue parameters (e.g. 211-212, 214-217), and per-entry parameters (e.g. 350-361). Each queue can be programmed to have a different set of per-queue parameters, and each entry within a queue can be programmed to have a different set of per-entry parameters. In addition, serial communication circuitry (10) can perform serial data transfers in response to the assertion of a trigger signal (30) from a source such as a timer (63) or a central processing unit (61). As a result, data transfers can be more precisely related to a particular timing signal or set of timing signals.

Abstract: A method for identifying a principal tooth in a series of teeth extending along at least a portion of a periphery of a rotatable object includes the steps of rotating the rotatable object, setting a counter to a predetermined value, measuring a first tooth in the series of teeth to obtain a first measurement, adding a qualifying value to the measurement to obtain a qualification measurement, measuring a second tooth in the series of teeth to obtain a second measurement, comparing the second measurement to the qualification measurement, and identifying the second tooth as the principal tooth when the second measurement exceeds the qualification measurement.

Abstract: A filtering device for filtering noise from an electronic signal having a plurality of defined periods includes an input terminal for receiving the electronic signal, a period divider for dividing each of the definable periods into an equal number of subdivisions, a filter creating a latching signal for a predetermined portion of the number of subdivisions, and a latch for receiving the latching signal from the filter and for maintaining the electronic signal in steady state for a predetermined portion of the number of subdivisions.

Abstract: A method and system for generating a position dependent output control signal. The position of a rotating machine, such as an internal combustion engine, is sensed and a corresponding position signal is generated. The position signal is processed to obtain the position dependent output control signal including a first control signal and a second control signal. The first control signal represents a sector of the rotating machine, and the second control signal represents the absolute position within the sector.