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ALU

Largely simplified block schematic to demonstrate where the ALU is located in the PIC 16F1937 Architecture:

ALU:

• The ALU (Arithmetic Logic Unit) is the heart of the PICmicro.
• Everything passes through this unit.
• The program in the Flash memory tells the ALU what to do.
• The ALU can send data to, and fetch data from all the separate blocks and Ports in the PICmicro by the 8-bit wide data-bus.
• The ALU needs 4 external oscillator clock pulses to execute one whole instruction.
• How an ALU works is actually very complicated. Fortunately Flowcode programmers do not need to know more than this.