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| 型號： | V30MZ |
| 英文描述： | V30MZ(TM) Hardware (Preliminary) | User＇s Manual[01/2002] |
| 中文描述： | V30MZ（TM）硬件（初步）|用戶手冊[01/2002] |
| 文件頁數(shù)： | 28/89頁 |
| 文件大?。?/td> | 418K |
| 代理商： | V30MZ |
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CHAPTER 3 CPU FUNCTIONS
28
<2> Binary multiplication/subtraction
Undefined.
(c) Auxiliary carry flag (AC)
<1> Binary addition/subtraction
In the case of processing in byte units, it is set when there is a carry from the lower 4 bits to the higher
4 bits or a borrow from the higher 4 bits to the lower 4 bits, and cleared otherwise.
In a word operation, it performs the same operation as for a byte operation with respect to the lower
bytes.
<2> Logical operation, binary multiplication/division, shift/rotate
Undefined.
(d)
Zero flag (Z)
<1> Binary addition/subtraction, logical operation, shift/rotate
It is set when the 8 bits and 16 bits of the result are all 0 for a byte operation and word operation,
respectively, and cleared otherwise.
<2> Binary multiplication/division
Undefined.
(e)
Sign flag (S)
<1> Binary addition/subtraction, logical operation, shift/rotate
Set when bit 7 of the result is 1 and cleared when it is 0 in the case of a byte operation.
Set when bit 15 of the result is 1 and cleared when it is 0 in the case of a word operation.
<2> Binary multiplication/division
Undefined.
(f)
Overflow flag (V)
<1> Binary addition/subtraction
Set when carries from bit 7 and bit 6 are different and cleared when they are the same in the case of a
byte operation.
Set when carries from bit 15 and bit 14 are different and cleared when they are the same in the case
of a word operation.
<2> Binary multiplication
As a result of an unsigned byte operation, cleared if AH is 0 and set otherwise.
As a result of a signed byte operation, cleared if AH is sign extension of AL and set otherwise.
As a result of an unsigned word operation, cleared if DW is 0 and set otherwise.
As a result of a signed word operation, cleared if DW is sign extension of AW and set otherwise.
In the case of an 8-bit immediate operation, cleared if the product is within 16 bits and set if the
product exceeds 16 bits.
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