Week 2
                8051 Assembly Language 
                       Programming
                        Chapter 2
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             Outline
             2.1  Inside the 8051
             2.2  Introduction to 8051 Assembly 
               programming
             2.3  Assembling and running an 8051 program
             2.4  The program counter and ROM space in 
               the 8051
             2.5  8051 data types and directives
             2.6  8051 flag bits and the PSW register
             2.7  8051 register banks and stack
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              Inside the 8051
              ‰ On-chip ROM to save your program
                 ❍ Program is burned in ROM.
                 ❍ Program is fixed and is not supposed to change.
              ‰ On-chip RAM to save some temporary data 
                 generated in execution time
                 ❍ Data can be changed.
                 ❍ Data is lost  when the 8051 powers down.
              ‰ Registers to store information temporarily
                 ❍ Some registers are used for internal operations of the 
                   8051.
                 ❍ Some registers are located in RAM. Some have their 
                   special locations.
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          On-chip RAM
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