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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 1138.87KB

  • 289頁(yè)

  • NEC   NEC

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CHAPTER 7
SYSTEM REGISTER (SYSREG)
7.7.2 Functions of the Program Status Word
The flags of the program status word are used for setting conditions for arithmetic/logical operations and data
transfer instructions and for reflecting the status of operation results. Figure 7-17 shows an outline of the functions
of the program status word.
Figure 7-17. Outline of Functions of the Program Status Word
Address
Bit
Symbol
7EH
7FH
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
RPL
PSW
B C C Z
I
X
E
Flag
C M Y
D P
Flag
Function of PSWORD
Used to specify that index modification be performed on the data
memory address used when a data memory manipulation instruction is
executed.
0: Index modification disabled.
1: Index modification enabled.
Set when the result of an arithmetic operation is 0.
0: Indicates that the result of the arithmetic operation is a value other
than 0.
1: Indicates that the result of the arithmetic operation is 0.
Set when there is a carry in the result of an addition operation or a
borrow in the result of a subtraction operation.
0: Indicates there was no carry or borrow.
1: Indicates there was a carry or borrow.
Used to specify that the result of an arithmetic operation not be stored
in data memory or the general register but just be reflected in the CY
and Z flags.
0: Results of arithmetic operations are stored.
1: Results of arithmetic operations are not stored.
Used to specify how arithmetic operations are performed.
0: Arithmetic operations are performed in 4-bit binary.
1: Arithmetic operations are performed in BCD.
IXE
Z
CY
CMP
BCD
62

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