NEC 78K/0S Series User Manual page 73

CMP
[Instruction format]
[Operation]
[Operand]
Mnemonic
CMP A, #byte
saddr, #byte
A, r
A, saddr
[Flag]
Z AC
× ×
[Description]
•
The source operand (src) specified with the 2nd operand is subtracted from the destination operand (dst)
specified with the 1st operand.
The subtraction result is not stored anywhere and only the Z, AC, and CY flags are changed.
•
If the subtraction result is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0).
•
If the subtraction generates a borrow at bit 7, the CY flag is set (1). In all other cases, the CY flag is cleared
(0).
•
If the subtraction generates a borrow from bit 4 to bit 3, the AC flag is set (1). In all other cases, the AC flag
is cleared (0).
[Description example]
CMP 0FE38H, #38H; 38H is subtracted from the contents at address FE38H and only the Z, AC, and CY flags
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
CMP dst, src
dst – src
Operand (dst, src)
CY
×
are changed (comparison of contents at address FE38H and the immediate data).
User's Manual U11047EJ3V0UM00
Byte Data Comparison
Mnemonic Operand (dst, src)
CMP A, !addr16
A, [HL]
A, [HL + byte]
Compare
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