參數(shù)資料
型號: μPD789418
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 37/125頁
文件大?。?/td> 366K
代理商: ΜPD789418
CHAPTER 3 ADDRESSING
20
3.2.4 Register Addressing
[Function]
A general-purpose register is accessed by specifying it as an operand. The general-purpose register to be
accessed is specified with a register specification code or function name in an instruction code.
Register addressing is carried out when an instruction with the following operand format is executed. When
an 8-bit register is specified, one of the eight registers is specified with 3 bits (register specification code) in
the instruction code.
[Operand format]
Identifier
Description
r
X, A, C, B, E, D, L, H
rp
AX, BC, DE, HL
'r' and 'rp' can be described with absolute names (R0 to R7 and RP0 to RP3) as well as functional names (X,
A, C, B, E, D, L, H, AX, BC, DE, and HL).
[Description example]
MOV A,C; When selecting the C register for r
Instruction code
0
0
0
0
1
0
1
0
0
0
1
0
0
1
0
1
INCW DE; When selecting the DE register pair for rp
Instruction code
1
0
0
0
1
0
0
0
Register specification code
Register specification code
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