Hi,
I think that the highest frequency you can get out of the CCP module is 2.5Mhz when the chip running at 20Mhz. Even so I don't think it's going to do what you want since there's no easy way to control the number of cycles or "pulses" that is going out and as far I understand you need exactly 4096 "pulses".

Perhaps it's possible to connect the CCP output back into a counter input and set that up to generate an interrupt which stops the CCP module at the right spot but it seems like a long shot.

I'm definetly no "ASM-guy" but to set and reset a pin (or rather the port latch) in ASM you can do:
Code:
@ BSF PORTA, 3
@ BCF PORTA, 3
But even if you put 4096 of those in a row you won't get more that 2.5Mhz because each instruction takes one cycle and one cycle is Fosc/4 meaning 200ns per cycle @20MHz so the frequency would be 1/400ns=2.5Mhz. Not to mention you'd fill up the flash memory of the 16F88....

How about this, I THINK it should run faster than your For i = 0 to 4095 loop.
Code:
i VAR BYTE
j VAR BYTE
For i = 1 to 16      '16*256=4096
  For j = 0 to 255
@  BSF PORTA, 3
@  BCF PORTA, 3
  NEXT
NEXT
If I'm right that inner loop seems to execute in 7 cycles and the outer loop seems to take another 12 for a total of (7*256*16)+(12*16)=28864 cycles @ 200ns each. A total of 5772.8us for 4096 pulses or an average frequency of ~709kHz. There will be some jitter in the pulsestream when it goes from the inner to outer loop but I guess it doesn't matter(?)

/Henrik.