>>
I am trying to use timer2 on a 16F877 to create an interrupt roughly
every 50mS.

To this end I have enabled the software interrupt in CCP2CON to
software trigger (0x0A), loaded CCPR2L with 'd' 30. T2CON I have
postscale *16, PIE2 is enabled as is PIE in INTCON (I'm using TMR1
elsewhere).
<<

That's not how timer 2 is used to create a periodic interrupt.  RTFM,
section 7.0 "Timer 2 module" on pages 55 and 56 of "PIC 16F87x Data Sheet"
(DS3029C).

In short, you set up T2CON and PR2, which periodically sets the TMR2IF bit.
As an example, see the HAL_INTR.ASPIC module at
http://www.embedinc.com/pic/hal.htm.  I'll be glad to help with specific
questions once you've done your homework.


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