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| 型號(hào)： | 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(cè)[01/2002] |
| 文件頁(yè)數(shù)： | 27/89頁(yè) |
| 文件大?。?/td> | 418K |
| 代理商： | V30MZ |
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CHAPTER 3 CPU FUNCTIONS
27
Figure 3-1. Program Status Word (PSW)
MD
1
V
IE
S
0
0
1
1
1
DIR
BRK
Z
AC
P
CY
15
13
11
9
7
5
3
1
14
12
10
8
6
4
2
0
Bits 7 to 0 can be stored or restored in AH by a MOV instruction.
All bits of the PSW are saved to the stack when an interrupt is generated or in execution of a call instruction
(CALL) and restored by a return instruction (RET, RETI).
The PSW can be saved or restored to the stack independently by a PUSH PSW instruction or POP PSW
instruction.
The flags are set to the states shown below after execution of each instruction.
(a)
Carry flag (CY)
<1> Binary addition/subtraction
In the case of processing in byte units, CY is set when there is a carry or borrow from operation result
bit 7, and cleared otherwise.
In the case of word operation, CY is set when there is a carry or borrow from operation result bit 15,
and cleared otherwise.
It is not changed by an increment or decrement instruction.
<2> Logical operation
CY is cleared without regard to the operation result.
<3> Binary multiplication
CY is cleared if AH is other than 0 as a result of an unsigned byte operation.
CY is cleared if AH is AL sign extension as a result of a signed byte operation and set otherwise.
CY is cleared if DW is 0 as a result of an unsigned word operation and set otherwise.
CY is cleared if DW is AW sign extension as a result of an unsigned word operation and set otherwise.
In the case of an 8-bit immediate operation, CY is cleared when the product is within 16 bits and set
otherwise.
<4> Binary division
Undefined.
<5> Shift/rotate
In the case of a shift or rotate including the CY flag, CY is set when the bit shifted to the CY flag is 1
and cleared if 0.
(b) Parity flag (P)
<1> Binary addition/subtraction, logical operation, shift
Set when the number of “1” bits of the lower 8 bits of the operation result is even and cleared when it
is odd.
Set when the result is all 0.
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