51795B datasheet(93/100 Pages) MICROCHIP

93 / 100 page

Glossary

 2010 Microchip Technology Inc.

DS51795B-page 93

Shell

The MPASM assembler shell is a prompted input interface to the macro assembler.

There are two MPASM assembler shells: one for the DOS version and one for the

Windows version.

Simulator

A software program that models the operation of devices.

Single Step

This command steps though code, one instruction at a time. After each instruction,

MPLAB IDE updates register windows, watch variables, and status displays so you can

analyze and debug instruction execution. You can also single step C compiler source

code, but instead of executing single instructions, MPLAB IDE will execute all assembly

level instructions generated by the line of the high level C statement.

Skew

The information associated with the execution of an instruction appears on the proces-

sor bus at different times. For example, the executed opcodes appears on the bus as

a fetch during the execution of the previous instruction, the source data address and

value and the destination data address appear when the opcodes is actually executed,

and the destination data value appears when the next instruction is executed. The trace

buffer captures the information that is on the bus at one instance. Therefore, one trace

buffer entry will contain execution information for three instructions. The number of cap-

tured cycles from one piece of information to another for a single instruction execution

is referred to as the skew.

Skid

When a hardware breakpoint is used to halt the processor, one or more additional

instructions may be executed before the processor halts. The number of extra

instructions executed after the intended breakpoint is referred to as the skid.

Source Code

The form in which a computer program is written by the programmer. Source code is

written in a formal programming language which can be translated into machine code

or executed by an interpreter.

Source File

An ASCII text file containing source code.

Special Function Registers

The portion of data memory (RAM) dedicated to registers that control I/O processor

functions, I/O status, timers or other modes or peripherals.

SQTP

See Serialized Quick Turn Programming.

Stack, Hardware

Locations in PIC microcontroller where the return address is stored when a function call

is made.

Stack, Software

Memory used by an application for storing return addresses, function parameters, and

local variables. This memory is typically managed by the compiler when developing

code in a high-level language.

MPLAB Starter Kit for Device

Microchip’s starter kits contains everything needed to begin exploring the specified

device. View a working application and then debug and program you own changes.

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