BME303_lecture11 - BME303 Intro to Computing Programming...

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BME303 Intro. to Computing
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Programming Languages
• Generally, programming
languages describe programs
at various levels of detail,
where the coarsest
classification distinguishes
– high level languages (e.g., C,
C++, Fortran, Pascal, etc.)
– low level languages which are
much “closer” to the
underlying ISA
• Whatever the level, a program
written in that language must
be translated to a program in
machine language (ML) , i.e.,
its instructions are in the
computer’s ISA.
Problem
Language
Machine (ISA) Architecture
Algorithms
Micro-architecture
Circuits
Devices
Human
Analytical thinker
Programmer
Compiler, Assembler
Electrons
BME303 Intro. to Computing
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Chapter 7: Assembly Language
High-level
Language
Program
Assembly
Language
Program
Machine
Language
Program
Compiler Assembler
Programmer  Programmer  Computer

Computer Computer
• Instead of writing in machine code we can write our programs using
a more "friendly“ programming language:
– Assembly language (now)
– C++, MATLAB, LabVIEW (later)
• System software provides us with software tools to translate
programs into machine code:
– Assembler
– Compiler

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BME303 Intro. to Computing
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Chapter 7: Assembly Language
High-level
Language
Program
Assembly
Language
Program
Machine
Language
Program
Compiler Assembler
Programmer  Programmer  Computer

Computer Computer
• Outline:
– Assembly Language (Instructions…)
– Assembly process
– Style
BME303 Intro. to Computing
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The Instruction Mnemonics
• Mnemonic: A system to develop or
improve the memory.
• Better term: Symbolic Name
• ADD, AND, NOT, LD, LDI, LDR, LEA , ST,
STI, STR, BR, TRAP, JMP, JSR/JSSR,
RTI
• Still have a one-to-one correspondence
with Machine Language Instructions