RL78/G13 CHAPTER 3 CPU ARCHITECTURE
R01UH0146EJ0100 Rev.1.00 154
Sep 22, 2011
3.4 Addressing for Processing Data Addresses
3.4.1 Implied addressing
[Function]
Instructions for accessing registers (such as accumulators) that have special functions are directly specified with the
instruction word, without using any register specification field in the instruction word.
[Operand format]
Because implied addressing can be automatically employed with an instruction, no particular operand format
is necessary.
Implied addressing can be applied only to MULU X.
Figure 3-33. Outline of Implied Addressing
A register
OP code
Memory
3.4.2 Register addressing
[Function]
Register addressing accesses a general-purpose register as an operand. The instruction word of 3-bit long is used
to select an 8-bit register and the instruction word of 2-bit long is used to select a 16-bit register.
[Operand format]
Identifier Description
r X, A, C, B, E, D, L, H
rp AX, BC, DE, HL
Figure 3-34. Outline of Register Addressing
Register
OP code
Memory
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