Special Function Register (Sfr) Addressing - NEC switch User Manual

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 be accessed with short direct addressing.
[Operand format]
Identifier
sfr Special function register name
[Description example]
MOV PM0, A; When selecting PM0 for sfr
[Illustration]
7
15
Effective
1 1
Address
CHAPTER 3
Description
Instruction code
0
Opcode
sfr-offset
8 7
1 1 1 1 1 1
User's Manual U12978EJ3V0UD
CPU ARCHITECTURE
1 1 1 0 0 1 1
0 0 1 0 0 0 0
0
1
0
SFR
53