Special-Function Register (Sfr) Addressing - NEC 78K/0 Series User Manual

3.2.5 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
sfr Special function register name
sfrp 16-bit-manipulatable special function register name (even address only)
[Description example]
MOV PM0, A; When selecting PM0 for sfr
Instruction code
[Illustration]
7
OP code
sfr-offset
15
Effective
1 1 1 1
address
28
CHAPTER 3 ADDRESSING
1 1 1 1
0 0 1 0
0
8 7
1 1 1 1
User's Manual U12326EJ4V0UM
Description
0 1 1 0 OP code
0 0 0 0 20H (sfr-offset)
0
SFR