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CHAPTER 3 CPU ARCHITECTURE
User's Manual U11919EJ3V0UM00
65
3.4.3 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 also be accessed with short direct addressing.
[Operand format]
Identifier
Description
sfr
Special function register name
[Example]
MOV PM0, A; When selecting PM0 for sfr
Instruction Code
1
1
1
0
0
1
1
1
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
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