wrteei

Write MSR External Enable Immediate

wrteei E

Updates the EE bit of the MSR from an immediate.

Encoding

Binary Layout

31

0:5

/

6:10

/

11:15

E

16:20

163

21:30

/

31

 

Format X-form

Opcode 0x7C000146

Extension Embedded

Operands

• E
  Enable (0/1)

Example

wrteei 0

Related

More in Embedded

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

Updates the Machine State Register (MSR) External Enable (EE) bit from the immediate value E (0 or 1). This instruction is privileged and provides a quick way to enable or disable external interrupts. The EE bit controls whether external interrupts are recognized by the processor.

Operation

MSR.EE ← E