CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U16315EJ1V0UD
74
3.4.5 Special function register (SFR) addressing
[Function]
A 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 SFRs
mapped at FF00H to FF1FH can be accessed with short direct addressing.
[Operand format]
Identifier
Description
sfr
Special function register name
sfrp
16-bit manipulatable special function register name (even address
only)
[Description example]
MOV PM0, A; when selecting PM0 (FF20H) as sfr
Operation code
1
1
1
1
0
1
1
0
OP code
0
0
1
0
0
0
0
0
20H (sfr-offset)
[Illustration]
15
0
SFR
Effective address
1
1
1
1
1
1
1
8 7
0
7
OP code
sfr-offset
1