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Integrated J1850 Protocol Provides for a Low-Cost Networking Solution
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Abstract
The J1850 specification was officially adopted by SAE as the standard protocol for Class B in-vehicle networks on February 1 1994 J1850 has been a recommended practice for seven years and has gained wide acceptance throughout North America Today J1850 is implemented in many production vehicles for data-sharing and diagnostic purposes The widespread integration of J1850 in-vehicle networks is contingent upon low-cost implementation into apphcations such as ABS engine, transmission and instrumentation In order to address this need, Intel Automotive has developed a very low-cost J1850 protocol handler designed specifically to be integrated onto high-performance MCS®96 microcontrollers.
This paper introduces Intel's J1850 protocol handler which supports both GM and Chrysler versions of J1850 Integrating the J1850 protocol onto microcontrollers allows for faster access and therefore reduces service overhead The described J1850 protocol handler will handle network protocol functions including access arbitration in-frame responses, error detection and delay compensation A digital noise filter automatically rejects unwanted noise pulses Three dedicated interrupts and byte-level message buffering provide for efficient interrupt handling This implementation is consistent with the industry's goal to drive J1850 implementation below $2 00 per node.
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Citation
Boehmer, D., "Integrated J1850 Protocol Provides for a Low-Cost Networking Solution," SAE Technical Paper 960123, 1996, https://doi.org/10.4271/960123.Also In
References
- SAE Vehicle Network for Multiplexing and Data Communications Standards Committee SAE J1850 Standard “Class B Data Communications Network Interface” MAY 94
- Intel Corporation 8XC196LB Target Specification October 18 1995
- Intel Corporation 8XC196Kx, 8XC196Jx 87C196CA Microcontroller User s Manual June 1995
- Harris Semiconductor HIP7020 Data Sheet February 1994