NEC Renesas V850/SC1 User Manual page 92

(2) Program status word (PSW)
After reset: 00000020H
31
PSW
RFU Reserved field (fixed to 0).
NP
0 NMI servicing not under execution.
1 NMI servicing under execution.
This flag is set (1) when an NMI is acknowledged, and disables multiple
interrupts. For details, refer to 7.2.3 NP flag.
EP
0 Exception processing not under execution.
1 Exception processing under execution.
This flag is set (1) when an exception is generated. Interrupt requests can be
acknowledged when this bit is set. For details, refer to 7.4.3 EP flag.
ID
0 Maskable interrupt acknowledgement enabled.
1 Maskable interrupt acknowledgement disabled.
This flag is set (1) when a maskable interrupt request is acknowledged. For
details, refer to 7.3.6 ID flag.
Note
SAT
0 Not saturated.
This flag is not cleared (0) if the result of saturated operation instruction execution
is not saturated while this flag is set (1). To clear (0) this flag, write the PSW
directly.
1 Saturated.
CY
0 Overflow has not occurred.
1 Overflow occurred.
Note
OV
0 Overflow has not occurred.
1 Overflow occurred.
Note
S
0 The operation result was positive or 0.
1 The operation result was negative.
90
CHAPTER 3
RFU
Non-maskable interrupt (NMI) servicing status
Exception processing status
Maskable interrupt servicing specification
Saturation detection of operation result of saturation operation instruction
Detection of carry or borrow of operation result
Detection of overflow during operation
Detection of operation result positive/negative
User's Manual U15109EJ3V0UD
CPU FUNCTIONS
8 7 6 5 4 3
NP EP ID SAT CY OV
(1/2)
2 1 0
S Z