CHAPTER 3 CPU ARCHITECTURE
72 User’s Manual U15331EJ4V1UD
3.4.4 Register addressing
[Function]
In the register addressing mode, general-purpose registers are accessed as operands. The general-purpose
register to be accessed is specified by a register specification code or functional name in the 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 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 0 0001010
00100101
Register specification code
INCW DE; When selecting the DE register pair for rp
Instruction code 1 0 0 01000
Register specification code