CHAPTER 3 CPU ARCHITECTURE
User's Manual U11919EJ3V0UM00
65
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 also be accessed with short direct addressing.
[Operand format]
Identifier
Description
sfr
Special function register name
[Example]
MOV PM0, A; When selecting PM0 for sfr
Instruction Code
1
1
1
0
0
1
1
1
0
0
1
0
0
0
0
0
[Illustration]
15
0
SFR
Effective
Address
1
1
1
1
1
1
1
8 7
0
7
OP Code
sfr-offset
1
Содержание mPD789026 Subseries
Страница 2: ...User s Manual U11919EJ3V0UM00 2 MEMO...
Страница 8: ...User s Manual U11919EJ3V0UM00 8 MEMO...
Страница 12: ...User s Manual U11919EJ3V0UM00 12 MEMO...
Страница 22: ...User s Manual U11919EJ3V0UM00 22 MEMO...
Страница 32: ...User s Manual U11919EJ3V0UM00 32 MEMO...
Страница 84: ...User s Manual U11919EJ3V0UM00 84 MEMO...
Страница 92: ...User s Manual U11919EJ3V0UM00 92 MEMO...
Страница 104: ...User s Manual U11919EJ3V0UM00 104 MEMO...
Страница 166: ...User s Manual U11919EJ3V0UM00 166 MEMO...
Страница 178: ...User s Manual U11919EJ3V0UM00 178 MEMO...
Страница 184: ...User s Manual U11919EJ3V0UM00 184 MEMO...
Страница 204: ...User s Manual U11919EJ3V0UM00 204 MEMO...
Страница 206: ...User s Manual U11919EJ3V0UM00 206 MEMO...
Страница 212: ...User s Manual U11919EJ3V0UM00 212 MEMO...