NEC 78K/0S Series User Manual page 67

ADDC
[Instruction format]
[Operation]
[Operand]
Mnemonic
ADDC A, #byte
saddr, #byte
A, r
A, saddr
[Flag]
Z AC
× ×
[Description]
•
The destination operand (dst) specified with the 1st operand, the source operand (src) specified with the 2nd
operand, and the CY flag are added and the result is stored in the destination operand (dst) and the CY flag.
The CY flag is added to the least significant bit. This instruction is mainly used to add two or more bytes.
•
If the addition result shows that dst is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0).
•
If the addition generates a carry from bit 7, the CY flag is set (1). In all other cases, the CY flag is cleared (0).
•
If the addition generates a carry from bit 3 to bit 4, the AC flag is set (1). In all other cases, the AC flag is
cleared (0).
[Description example]
ADDC A, [HL]; The A register contents, the contents at address (HL register), and the CY flag are added and
the result is stored in the A register.
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
ADDC dst, src
dst, CY ← dst + src + CY
Operand (dst, src)
CY
×
User's Manual U11047EJ3V0UM00
Addition of Byte Data with Carry
Mnemonic Operand (dst, src)
ADDC A, !addr16
A, [HL]
A, [HL + byte]
Add with Carry
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