ZiLOG Z8 User Manual page 168

Z8 Microcontrollers
Instruction Descriptions and Formats
DI
Disable Interrupts
Dl
Instruction Format:
Operation:
IMR (7) <— 0
Bit 7 of Control Register FBH (the Interrupt Mask Register) is reset to 0. All interrupts are disabled, although they
remain "potentially" enabled. (For instance, the Global Interrupt Enable is cleared, but not the individual interrupt
level enables.)
Flags: C: Unaffected
Z: Unaffected
S: Unaffected
V: Unaffected
D: Unaffected
H: Unaffected
Example:
If Control Register FBH contains 8AH (10001010) (interrupts IRQ1 and IRQ3 are enabled), the statement:
sets Control Register FBH to 0AH (00001010B) and disables these interrupts.
12-28
DI
Op Code: 8F
ZiLOG
DISABLE INTERRUPTS
UM001601-0803
DI