UPD78F9234MC-5A4-A Datasheet, PDF (49/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 3 CPU ARCHITECTURE
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
Description
Special function register name
[Description example]
MOV PM0, A; When selecting PM0 for sfr
Instruction code 1 1 1 0 0 1 1 1
00100000
[Illustration]
7
0
OP code
sfr-offset
15
87
Effective
address
11111111
SFR
0
User’s Manual U17446EJ5V0UD
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