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Multiplexor Device for selecting and outputting a single stream of data from a number of incoming data sources See Demultiplexor, Demux, and Mux Mux Abbreviation for multiplexor Negative active logic A type of logic where the digital signal is said to be asserted if it is at a low (0) value See Positive active logic Nesting Placing subroutine or interrupt execution within the execution of other subroutines or interrupts..

These instructions work the number of bits that is the data word size (the PIC MCU has an 8-bit word size) Many processors are capable of carrying out multiplication, division and comparison operations on data types of varying sizes, as well as logarithmic and trigonometric operations For most microcontrollers, such as the PIC microcontroller, the word size is 8 bits and advanced data processing operations are not available Execution change instructions include branches, gotos, skips, calls, and interrupts For branches and gotos, the new address is speci ed as part of the instruction Branches and gotos are similar except that branches are used for short jumps that cannot access the entire program memory and are used because they take up less memory and execute in fewer instruction cycles Gotos give a program the ability to jump to a new location anywhere in the processor s instruction address space.

Branches and gotos are generally known as nonconditional because they are always executed when encountered by the processor There can be conditional branches or gotos and in some processors conditional skips are available Skips are instructions that will skip over the following instruction when a speci c condition is met The condition used to determine whether or not a branch, goto, or skip is to execute is often based on a speci c status condition If you have developed applications on other processors, you may interpret the word status to mean the bits built into the ALU STATUS register These bits are set after an arithmetic or bitwise logical instruction to indicate such things as whether or not the result was equal to zero, was negative, or caused an over ow.

These status bits are available in the PIC microcontroller, but are supplemented by all the other bits in the processor, each of which can be accessed and tested individually This provides a great deal of additional capabilities in the PIC MCU that is not present in many other devices and allows some amazing improvements in processor performance An example of using conditionally executing status bits is shown in the 16-bit variable increment example below After incrementing the lower 8 bits, if the processor s zero ag is not set (which indicates that the incremented register s contents have changed from 0xFF to 0x00), then the increment of the higher 8 bits is skipped But if the result of the lower 8-bit increment is equal to zero, then the skip instruction doesn t execute and the upper 8-bit increment is executed..

My husband, Frank, adjusts to different audiences when he gives presentations on climbing Mount Rainier. His typical audience is over twenty-one and has an interest in serious outdoor sports. He includes maps, slides, books, and an ice axe as props. However, when he gives a presentation for the Cub Scouts, he adapts by shortening

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The skip is used in the PIC microcontroller to provide conditional execution, which is why it is described in detail here. The skip instructions can access every bit in the PIC MCU s register space, making it a very powerful instruction, as will be described below. Other execution change instructions include call and interrupt, which causes execution to jump to a routine and return back to the instruction after the call/interrupt instruction. A call is similar to a branch or goto and has the address of the routine to jump to included in the instruction. The address after the call instruction is saved and when a return instruction is encountered, this address is used to return execution to the software that executed the original call instruction.