參數(shù)資料
型號: μPD789806Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 36/125頁
文件大小: 366K
代理商: ΜPD789806Y
CHAPTER 3 ADDRESSING
19
3.2.3 Special-Function Register (SFR) Addressing
[Function]
The memory-mapped special-function registers (SFRs) are 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 be accessed with short direct addressing.
[Operand format]
Identifier
Description
sfr
Special-function register name
[Description 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
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