參數(shù)資料
型號(hào): UPD178F054
英文描述: 78K/0 Series for Instructions | User's Manual[10/2001]
中文描述: 78K線/ 0系列說明|用戶手冊(cè)[10/2001]
文件頁數(shù): 84/129頁
文件大小: 644K
代理商: UPD178F054
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]
ZAC
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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