"I could not find a way to delay interrupts using the IE SFR... "

It's really simple Kundi: The question was how to ensure that a piece of code is not interrupted. This can be easily done by 'bracketing' the code with disable/enable interrupts. The interrupt enable flags are contained in the IE register and that's what Erik was referring to.

Example (in pseudocode):

clear EA                            // disable all interrupts
code-that-is-not-to-be-interrupted  // execute the code
set EA                              // re-enable interrupts

Best regards,
Rob.

PS. The post above this one is basically about the same thing.