An imaginary processor

Idea

• Understand the design and workings of a microprocessor by designing a fictional microcontroller.

Microcontroller

http://www.mikroe.com/img/publication/8051-books/programming-8051-mcu/chapter/ch1/01.gif

Memory

• The microcontroller has 16 bytes of memory addressed from 0x00 to 0x0F.
• Memory location 0x0F is a special "accumulator" memory that is used by programs during computation.

Instructions

• 0x0X - Copy to accumulator (WRITE)
• 0x1X - Copy from accumulator (READ)
• 0x2X - Add to accumulator (ADD)
• 0x3X - Subtract from accumulator (SUBT)
• 0x4X - Terminate (END)
• 0x5X - If acumulator is != 0 jump to memory X (IF)

Timer

• There is no fixed timer as in a microprocessor
• Instructions are executed at "person" speed