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3.4.2 Register addressing
[Function]
A general-purpose register is accessed as an operand. The general-purpose register to be accessed is specified
by register bank select flags (RBS0 and RBS1) and the register specification code (Rn, RPn) in the operation 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 operation code.
[Operand format]
'r' and 'rp' can be described using function names (X, A, C, B, E, D, L, H, AX, BC, DE, and HL) as well as absolute
names (R0 to R7 and RP0 to RP3).
[Description example]
MOV A, C; when selecting C register as r
Operation code
INCW DE; when selecting DE register pair as rp
Operation code
CHAPTER 3 CPU ARCHITECTURE
Identifier
Description
r
X, A, C, B, E, D, L, H
rp
AX, BC, DE, HL
0
1
1
0
0
0
1
0
0
0
0
1
User's Manual U11302EJ4V0UM
1
0
Register specification code
0
0
Register specification code
73
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