參數(shù)資料
型號: 780024Y
廠商: NEC Corp.
英文描述: Common to 78K/0 Series
中文描述: 共同的78K / 0系列
文件頁數(shù): 58/129頁
文件大?。?/td> 644K
代理商: 780024Y
58
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Subtract with Carry
SUBC
Subtraction of Byte Data with Carry
[Instruction format]
SUBC dst, src
[Operation]
dst, CY
dst
src
CY
[Operand]
Mnemonic
Operand(dst,src)
Mnemonic
Operand(dst,src)
SUBC
A, #byte
SUBC
A, !addr16
saddr, #byte
A, [HL]
A, r
Note
A, [HL+byte]
r, A
A, [HL+B]
A, saddr
A, [HL+C]
Note
Except r = A
[Flag]
Z
AC
CY
×
×
×
[Description]
The source operand (src) specified by the 2nd operand and the CY flag are subtracted from the destination
operand (dst) specified by the 1st operand and the result is stored in the destination operand (dst).
The CY flag is subtracted from the least significant bit. This instruction is mainly used for subtraction of two
or more bytes.
If the subtraction shows that dst is 0, the Z flag is set (1). In all other cases, the Z flag is cleared (0).
If the subtraction generates a borrow out of bit 7, the CY flag is set (1). In all other cases, the CY flag is
cleared (0).
If the subtraction generates a borrow for bit 3 out of bit 4, the AC flag is set (1). In all other cases, the AC
flag is cleared (0).
[Description example]
SUBC A, [HL];
The (HL register) address contents and the CY flag are subtracted from the A register and
the result is stored in the A register.
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