Special Function Register (Sfr) Addressing - NEC 78K0S/KA1+ User Manual

3.4.3 Special function register (SFR) addressing

[Function]
A memory-mapped special function register (SFR) is addressed with the 8-bit immediate data in an instruction
word.
This addressing is applied to the 256-byte space FF00H to FFFFH. However, SFRs mapped at FF00H to
FF1FH are 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
OP code
sfr-offset
15
Effective
1 1 1
address
CHAPTER 3 CPU ARCHITECTURE
Description
Instruction code 1 1
0 0
0
8 7
1 1 1 1 1
User's Manual U16898EJ3V0UD
1 0 0 1 1 1
1 0 0 0 0 0
0
SFR
43