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OSU8 Microprocessor
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16-bit ALU, Address Computations

This 16 bit ALU performs all of the math functions required for computing addresses. Only five operations are needed. Increment is used for normal program flow to increment the program counter, to execute stack push and increment the data pointer registers. Decrement is used for stack pop and data pointer decement. Two special functions are needed for relative branches, and of course a pass through without any change is used for ordinary data transfers from one register to another.

Schematic Drawing full adder full adder full adder full adder


OSU8: Simple 8-Bit Microprocessor Design; Paul Stoffregen
http://www.pjrc.com/tech/osu8/sch/alu16.html
Last updated: February 24, 2005
Status: These pages are a work-in-progress
Comments, Suggestions: <paul@pjrc.com>