![assembly instructions can
have up to 4 fields:
Format: [label]Mnemonic[operand][;comments]
NOTE:
only the mnemonic field is
always required](https://image.slidesharecdn.com/csolessonintro-131010205953-phpapp02/85/Cso-lesson-intro-11-320.jpg)
![Assembler directives can
have 4 fields:
Format: [name]directive[operand][;comments]
NOTE:
Only the directive field is
always required](https://image.slidesharecdn.com/csolessonintro-131010205953-phpapp02/85/Cso-lesson-intro-16-320.jpg)
Cso lesson intro
- 7. Some characteristics Low level language Platform dependent: not portable Works directly with microprocessors
- 8. Why assembly language? Makes you a better programmer Some problems can only be resolved using assembly language The only programming language that can talk directly to the hardware The only programming language that can talk directly to the hardware
- 9. Each statement in assembly can either be: 1. Assembly Language Instructions 2. Assembler directives Tells the machine what to do Tells the assembler what to do(with your instructions and data)
- 10. Constants in source statements: binary Sequence of numbers 0s and 1s followed by B decimal hexadecimal character Sequence of numbers 0 to 9, with or without letter D sequence of digits 0 through 9 and letters A to F followed by H (first character must be 0 to 9) string of letters, numbers or symbols enclosed in single or double quotes 1111B 1011B 100D 76 1ah 41h ‘A’ “I am a programmer”
- 11. assembly instructions can have up to 4 fields: Format: [label]Mnemonic[operand][;comments] NOTE: only the mnemonic field is always required
- 12. Label field: Assigns name to an assembly instruction Maximum of 31 characters and must with a colon (:) Can be A to Z(a to z), digits 0 to 9, and special characters like underscore(_) Cannot begin with a digit Registers(AX, BX, CX, DX, etc.) can not be used as labels
- 13. mnemonic field: Contains 2 to characters acronym for assembly language instruction
- 14. operand field: Tells the machine where to find data that it is to operate on In two-operand operations, the first letter is the destination and the second letter is the source
- 15. comment field: Describes the statements in the source program Starts with semi colon (;)
- 16. Assembler directives can have 4 fields: Format: [name]directive[operand][;comments] NOTE: Only the directive field is always required
- 17. END