First I must define some terms. In this system, a word is 8 bits (a byte). I will try to make sure that I don't use that term. However, if it shows up, you know what I mean. Unless otherwise noted, the details in this section apply to all versions.
The Arithmetic Logic Unit accepts 8 bit instructions/data. The instruction set allows for the following functions:
Memory is available as 1024, 2048, or 4096 bytes. The Program Counter is only 12 bits wide. However, only 11 bits of resolution are avaliable.
Data Memory is organized as 64, 128, or 256 bytes in the 8048AH, 8049AH, and 8050AH.
Ports 1 & 2:
Test & INT:
PC & Stack:
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