User’s Manual U11969EJ3V0UM00
53
CHAPTER 3 CPU FUNCTIONS
Figure 3-3. Program Status Word (PSW)
Bit Position
Bit Name
Function
31 to 8
RFU
Reserved field (fixed to 0).
7
NP
NMI Pending
Indicates that NMI processing is in progress. This flag is set when NMI is accepted,
and disables multiple interrupts.
6
EP
Exception Pending
Indicates that trap processing is in progress. This flag is set when an exception
occurs. Interrupt request is accepted even if this flag is set.
5
ID
Interrupt Disable
Indicates that accepting maskable interrupt request is disabled.
4
SAT
Saturated Math
This flag is set if result of executing saturated operation instruction overflows (if
overflow does not occur, value of previous operation is held).
3
CY
Carry
This flag is set if carry or borrow occurs as result of operation (if carry or borrow
does not occur, it is reset).
2
OV
Overflow
This flag is set if overflow occurs during operation (if overflow does not occur, it
is reset).
1
S
Sign
This flag is set if result of operation is negative. It is reset if result is positive.
0
Z
Zero
This flag is set if result of operation is zero (if result is not zero, it is reset).
31
RFU
1 0
Z
PSW
2
S
3
OV
4
CY
5
SAT
6
ID
7
EP
8
NP
After reset
00000020H
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