Intel MCS 51

i~.
MCS@-51PROGRAMMER’SGUIDE
AND INSTRUCTION SET
Theinformationpreaentedin this chapter is collectedfromthe MCW-51ArchitecturalOverviewandthe Hardware
Descriptionof the 8051,8052and 80C51chaptersof this book.The material has beenselected and rearrangedto
forma quickand convenientreferencefor the programmersof the MCS-51.This guidepertains specificallyto the
8051,8052and 80C51.
MEMORY ORGANIZATION
PROGRAM MEMORY
The 8051hasseparateaddressspacesfor ProgramMemoryand Data Memory.TheProgramMemorycan be up to
64Kbyteslong.The lower4K (8K for the 8052)may resideon-chip.
Figure 1showsa map of the 8051programmemory,and Figure 2 showsa map of the 8052programmemory.
m.
WK
BwEe
exrmful.
10M
— OR
FFFF
Omo
64K
evree
EXTERNAL
270249-1
Figure1.The 8051 Program Memory
2-3