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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U15104EJ2V0UD
3.4.5 Special Function Register (SFR) addressing
[Function]
The memory-mapped special function register (SFR) is addressed with 8-bit immediate data in an instruction
word.
This addressing is applied to the 240-byte spaces FF00H to FFCFH and FFE0H to FFFFH. However, the SFR
mapped at FF00H to FF1FH can be accessed with short direct addressing.
[Operand format]
Symbol
Description
sfr
Special function register name
sfrp
16-bit manipulatable special function register name (even address only)
[Example]
MOV PM0, A; when selecting PM0 (FF20H) as sfr
Operation code
1 1 1 1 0 1 1 0
0 0 1 0 0 0 0 0
[Illustration]
15
0
SFR
Effective address
1
1
1
1
1
1
1
8 7
0
7
OP code
sfr-offset
1