Memory Organization; Program Memory - Intel MCS 51 User Manual

i~. MCS@-51 P ROGRAMMER'S G UIDE
AND INSTRUCTION SET
The informationpreaentedin this chapter is collectedfrom the MCW-51 ArchitecturalOverviewand the Hardware
Descriptionof the 8051,8052and 80C51chapters of this book. The material has been selected and rearrangedto
form a quick and convenientreferencefor the programmersof the MCS-51.This guidepertains specificallyto the
8051,8052and 80C51.
MEMORY ORGANIZATION
PROGRAM MEMORY
The 8051
has separateaddressspacesfor Program Memoryand Data Memory.The Program Memorycan be up to
64K bytes long.The lower4K (8K for the 8052)may resideon-chip.
Figure 1 showsa map of the 8051program memory,and Figure 2 showsa map of the 8052program memory.
m.
WK
BwEe
exrmful.
10M
—
OR
FFFF
Omo
64K
evree
EXTERNAL
270249-1
Figure
1. The 8051 Program Memory
2-3