参数资料
型号: UPD178F124
英文描述: 78K/0 Series for Instructions | User's Manual[10/2001]
中文描述: 78K线/ 0系列说明|用户手册[10/2001]
文件页数: 48/129页
文件大小: 644K
代理商: UPD178F124
25
CHAPTER 3 ADDRESSING
User's Manual U12326EJ4V0UM
3.2.2 Register addressing
[Function]
Register addressing accesses a general-purpose register as an operand. The general-purpose register to
be accessed is specified by the register bank selection flags (RBS0 and RBS1) and the register specification
codes (Rn and RPn) in the instruction codes.
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 by 3 bits 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 function 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
01100010
INCW DE; When selecting the DE register pair for rp
Instruction code
10000100
Register specification code
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