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Many debug commands accept numeric expressions as parameters. A numeric expression is a number or a complex expression that contains numbers, debug objects, or operands. An expression can consist of any of the following components:

Component Description
Constants Constants are fixed numeric values or character strings.
System Variables System variables alter or affect the way µVision operates.
Peripheral Variables Peripheral register variables allow access to simulated on-chip peripherals.
Program Variables (Symbols) Program variables are the variables of your program. They are often called symbols or symbolic names.
Line Numbers Line numbers reference code addresses of executable programs. When you compile or assemble a program, the compiler and assembler include line number information in the generated object module.
Bit Addresses Bit addresses reference bit-addressable data memory.
Type Specifications Type specifications let you specify the data type of an expression or sub-expression.
Operators Operators include +, -, *, and /. Operators may be used to combine sub-expressions into a single expression. You may use all operators that are available in the C programming language.
Memory Type Specifiers Memory type specifiers that can be used with debugging commands in 80x51 microcontrollers.
Difference between µVision and C Differences to be aware of.
Expression Examples Code snippets explaining the usage of expressions you can enter in the Command Window.
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