NEC PD78078 用户手册

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Register specify code

Operation code

The general register is accessed as an operand.  The general register to be accessed is specified with register

bank select flags (RBS0 and RBS1) and register specify code (Rn, RPn) 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 operation code.

Identifier

Description

r

X, A, C, B, E, D, L, H

rp

AX, BC, DE, HL

‘r’ and ‘rp’ can be described with 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).

MOV A, C;  when selecting C register as r

INCW DE;  when selecting DE register pair as rp

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Register specify code

Operation code