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How can I visually determine the stepping identification information on the MCS 51 and MCS 251 Microcontrollers?

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How can I visually determine the stepping identification information on the MCS 51 and MCS 251 Microcontrollers?

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Stepping information is contained in the lot code identifier that is in the second line marking on the topside of the chip. The second line marking is referred to as the Intel® FPO# (Finished Process Order) and is an eight digit number.

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