Data processing system having a multi-function input/output port

Details Data processing system having a multi-function input/output port Data processing system having a multi-function input/output port

1995-05-15

1998-05-12

Lee, Thomas C.

395834, 395851, G06F 300, G06F 1578, G06F 124

Patent

active

057520771

ABSTRACT:
A data processing system (20) has a multi-function scalable parallel I/O port (44). The I/O port (44) includes a plurality of I/O port circuits (55, 56) coupled to I/O terminals (67, 77) . The I/O port (44) can multiplex two functions onto one terminal (67,77) . One function is an I/O function and the other function is function under the control of an internal module (22, 24, 26, 32) connected to the terminal (67, 77). Each I/O port circuit (55, 56) has either a pull-down circuit (68) or a pull-up circuit (78) coupled to the terminal (67, 77). The pull-up and pull-down circuits (78, 68) are controllable using a control register (81, 82). The pull-up and pull-down circuits (78, 68) for each terminal (67, 77) can be individually selected, and function whether the I/O port (44) is selected or deselected.

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Intel 8051 Handbook, Document Number:Unknown, Country:Japan, Translation:No, Name:Fig. 3-6 from Intel 8051 Handbook, pp. 47.

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