S3C84E5/C84E9/P84E9

INSTRUCTION SET

 

 

DI — Disable Interrupts

DI

Operation: SYM (0) 0

Bit zero of the system mode control register, SYM.0, is cleared to "0", globally disabling all interrupt processing. Interrupt requests will continue to set their respective interrupt pending bits, but the CPU will not service them while interrupt processing is disabled.

Flags: No flags are affected.

Format:

Bytes Cycles Opcode (Hex)

opc

1

4

8F

 

 

 

 

Example: Given: SYM = 01H:

DI

If the value of the SYM register is 01H, the statement "DI" leaves the new value 00H in the register and clears SYM.0 to "0", disabling interrupt processing.

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Samsung S3C84E5 user manual DI Disable Interrupts, Operation SYM 0 ←