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At the very beginning, I use CCS v4.032.
and I can handle a period wake up by using the following code

#include <16F88.h>
#FUSES INTRC, WDT, NOPROTECT ,NOLVP, NOBROWNOUT
#use delay ...

Then I found out about the new FAT code by CCS based on Microchip's MDD library. It indeed does work correctly - data can be written and read by the PIC, and also seen on a PC just fine.

Can you ...

Your test program doesn't compile. It's missing several things. To make
it compile I would have to imagine and write the missing routines. But
then it wouldn't be the actual same test program. I ...

You can do that search for any PIC data sheet. For 16F, it's always at 0004h. Look in your .LST file at that address. That's where the CCS interrupt dispatcher code is placed by the compiler (if ...

With regard to your delay testing code, those are code snippets, not a
complete test program with #include, #fuses, #use delay, main(), etc.
But in any case, I can't work on it until tomorrow.

Pr ...

Post your test programs for this. Complete (but short).

For delay_ms(1)
It seems that I use the following test program:
while(1)
{
output_high(PIN_A1);
delay_ms(1&# ...

To actually KNOW as to WHY it takes x us instead of y us, all you need do is dump out the listing of the program and 'play computer'.

Or use the 'stopwatch' feature in MPSIM. (MPLAB's Simulator) ...

also...
I just noticed..

you're using the internal rc oscillator

NOT a good choice for precise timing.

Read the datasheet section on oscillators, check the charts,....more homework !!

For ...

I looked at
the .LST file, and including the latency of the hardware interrupt, I count a
total of 58 instruction cycles for interrupt overhead. That's 29 us at 8 MHz.
That's just the overhead. ...

I post my code in the following in order that you can have a better analysis

///clear all interrupt flag bit in transceiver’s status register
irq_clear_transceiver()
{
unsign ...

You are asking why your assumptions are apparently wrong. But where do you get the numbers of expected execution time?
Did you consider the total overhead of interrupt processing?

Thanks very ...

I am using PIC16f88 (PIC16f88 to drive a RF transceiver), and the CCS version is 4.032.

I have a question about timing when an external interrupt happens during the delay_ms function.

Here lists ...