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CHAPTER 3 CPU FUNCTION

User’s Manual U15905EJ2V1UD

(4) Program status word (PSW)

The program status word (PSW) is a collection of flags that indicate the status of the program (result of

instruction execution) and the status of the CPU.

If the contents of a bit of this register are changed by using the LDSR instruction, the new contents are

validated immediately after completion of LDSR instruction execution. If the ID flag is set to 1, however,

interrupt request acknowledgment is disabled even while the LDSR instruction is being executed.

Bits 31 to 8 of this register are reserved for future function expansion (these bits are fixed to 0).

PSW

RFU

Default value

00000020H

SAT

Bit position

Flag name

Meaning

31 to 8

RFU

Reserved field. Fixed to 0.

Indicates that a non-maskable interrupt (NMI) is being serviced. This bit is set to 1 when an

NMI request is acknowledged, disabling multiple interrupts.

0: NMI is not being serviced.

1: NMI is being serviced.

Indicates that an exception is being processed. This bit is set to 1 when an exception

occurs. Even if this bit is set, interrupt requests are acknowledged.

0: Exception is not being processed.

1: Exception is being processed.

Indicates whether a maskable interrupt can be acknowledged.

0: Interrupt enabled (EI)

1: Interrupt disabled (DI)

SAT

Note

Indicates that the result of a saturation operation has overflowed and is saturated. Because

this is a cumulative flag, it is set to 1 when the result of a saturation operation instruction is

saturated, and is not cleared to 0 even if the subsequent operation result is not saturated.

Use the LDSR instruction to clear this bit. This flag is neither set to 1 nor cleared to 0 by

execution of an arithmetic operation instruction.

0: Not saturated

1: Saturated

Indicates whether a carry or a borrow occurs as a result of an operation.

0: Carry or borrow does not occur.

1: Carry or borrow occurs.

Note

Indicates whether an overflow occurs during operation.

0: Overflow does not occur.

1: Overflow occurs.

Note

Indicates whether the result of an operation is negative.

0: The result is positive or 0.

1: The result is negative.

Indicates whether the result of an operation is 0.

0: The result is not 0.

1: The result is 0.

Remark

Also read Note on the next page.

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