Browse Prior Art Database

Custom Microcontroller Gate Array for Automotive Use

IP.com Disclosure Number: IPCOM000034304D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 4 page(s) / 104K

Publishing Venue

IBM

Related People

Farrell, RH: AUTHOR [+3]

Abstract

This article describes a computer-controlled display system for automotive use. (Image Omitted) In order to reduce the cost of manufacturing an automobile dashboard, the mechanical display devices are being replaced with a reconfigurable computer-controlled display system. As shown in Fig. 1, the system has a driver information computer module interfacing to a display device, vehicle sensors and switches, and other vehicle systems. The vehicle sensors and switches allow the driver information computer to know the status of the automobile. The display device allows the driver information computer to inform the driver of vehicle status and options. The other vehicle systems include the engine computer, stereo devices, communications devices, and other types of systems.

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Custom Microcontroller Gate Array for Automotive Use

This article describes a computer-controlled display system for automotive use.

(Image Omitted)

In order to reduce the cost of manufacturing an automobile dashboard, the mechanical display devices are being replaced with a reconfigurable computer- controlled display system. As shown in Fig. 1, the system has a driver information computer module interfacing to a display device, vehicle sensors and switches, and other vehicle systems. The vehicle sensors and switches allow the driver information computer to know the status of the automobile. The display device allows the driver information computer to inform the driver of vehicle status and options. The other vehicle systems include the engine computer, stereo devices, communications devices, and other types of systems. The display system disclosed herein integrates most of the required functional modules needed in an automotive environment into one compact large-scale integration (LSI) module.

(Image Omitted)

Fig. 2 shows the pinout of the module. A unique feature of this design includes a method of utilizing the I/O pins for both external bus functions and port I/O operations. In normal microcontrollers, such as the INTEL 8051, a pin (-EA) is either tied high or low to enable the external memory mode or the I/O port mode. These two modes are exclusive, that is you can only have one or the other. The system of this disclosure allows for the changing of the mode using software. Referring again to Fig. 2, the -PORT/BUS input pin sets the default mode when the module is powered up. If the default mode of "BUS" is selected, then the pins have such functions as "address data", "interrupts" and other control signals. This allows the module to access external memory and other devices. If the "PORT" mode is selected, the pins can be written to or read from. This is useful when a minimum configuration system is required and external I/O devices need to...