Quote Originally Posted by richard View Post
...for this chip and timer1 interrupts its not necessary dt-ints will set PEIE for you but this has no relationship with PIE4.0, i have no idea how you made that inference...
I think I got that originally from the datasheet:
(16F18877 p.138)

Note: Bit PEIE of the INTCON register must be set to enable any peripheral interrupt controlled by registers PIE1-PIE8.

It looks to me like INTCOM is a master breaker; shutting that down shuts all interrupts.

And individual interrupts can be managed via their PIE registers (ie: PIE4 alone manages 6 timers)