NEC PD75402A - Manual (Page 174)

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CHAPTER 9. INSTRUCTION SET
9.4.3 Arithmetic and Logic Instructions
ADDS A, #n4
Function: A
←
A + n4; Skip if carry; n4 = I
3
to I
0
: 0 to FH
Binary adds 4-bit immediate data n4 to the contents of the A register and skips the next instruction if a carry
is generated. The carry flag is not affected.
When combined with an ADDC A, @HL instruction, this instruction becomes a base correction instruction.
(See section 9.1.)
ADDS A, @HL
Function: A
←
A + (HL); Skip if carry
Binary adds the data memory contents addressed by register pair HL to the contents of the A register and
skips the next instruction if a carry is generated. The carry flag is not affected.
ADDC A, @HL
Function: A, CY
←
A + (HL) + CY
Binary adds the data memory contents addressed by register pair HL to the contents of the A register,
including the carry flag. If a carry is generated, the carry flag is set. If a carry is not generated, the carry flag
is reset.
When an ADDS A, #n4 instruction is placed after this instruction, when a carry is generated at this instruction,
the ADDS A, #n4 instruction is skipped. When a carry is not generated, the ADDS A, #n4 instruction is executed
and the skip function of the ADDS A, #n4 instruction is disabled. Therefore, the combination of these
instructions can be used in base correction (see section 9.1).
AND A, @HL
Function: A
←
A
∧
(HL)
ANDs the contents of the A register and the data memory contents addressed by register pair HL and sets
the result into the A register.