| 摘要 |
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.
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