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ADDRESS SPACES S3C84E5/C84E9/P84E9
2-8
PRIME REGISTER SPACE
The lower 192 bytes (00H–BFH) of the S3C84E5/C84E9/P84E9's two 256-byte register pages is called prime
register area. Prime registers can be accessed using any of the seven addressing modes (see Chapter 3,
"Addressing Modes.")
The prime register area on page 0 is immediately addressable following a reset. In order to address prime registers
on pages 0, or 1 you must set the register page pointer (PP) to the appropriate source and destination values.
FFH
F0H
E0H
D0H
C0H
Set 1
Bank 0
Peripheral and I/O
General-purpose
CPU and system control
FFH
C0H
Set 2
00H
Prime
Space
BFH
Bank 1
Page 1
Page 0
Page 0
Figure 2-4. Set 1, Set 2, Prime Area Register