Special Function Register (Sfr) Addressing - NEC mPD78F0730 Preliminary User's Manual

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]
[Description example]
MOV PM0, A; when selecting PM0 (FF20H) as sfr
[Illustration]
Effective address
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CHAPTER 3 CPU ARCHITECTURE
Identifier
sfr Special function register name
sfrp 16-bit manipulatable special function register name (even address only)
Operation code 1
0
7
OP code
sfr-offset
15
1 1 1 1 1 1 1 1
Preliminary User's Manual U19014EJ1V0UD
Description
1 1 1 0 1 1 0 OP code
0 1 0 0 0 0 0 20H (sfr-offset)
0
8 7
SFR
0
55