Serial/parallel input/output bus for microprocessor system

Details Serial/parallel input/output bus for microprocessor system Serial/parallel input/output bus for microprocessor system

1983-07-26

1984-07-31

Thomas, James D.

Boots, shoes, and leggings

G06F 300, G06F 1300

Patent

active

044634218

ABSTRACT:
A single-chip microprocessor device of the MOS/LSI type contains an ALU, several internal busses, a number of address/data registers, and an instruction register with associated control decode or microcontrol generator circuitry. The device communicates with external memory and peripherals by a bidirectional multiplexed address/data bus and a number of control lines. For a given set of addresses parallel data transfers occur and for a different set of addresses serial data transfers occur. A single instruction may transfer one bit, multiple bits in series, or bytes or words in parallel; the serial or parallel mode is specified by the address, so software may be written without regard for the type of interface. This serial/parallel I/O port shares the address/data bus with memory and may be used with any memory-mapped peripheral.

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Budzinski, R., "Single-Chip Computer Scrambles for Security," Electronics, vol. 52, No. 15, (Jul. 19, 1979), pp. 140-144.

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