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Ok, I will simplify the code, no usb, no spi.

As simple as this:
Mcu sleeping all time.
Timer1 runing from external 32khz, interrupt on overflow every 2sec.
If I press button (short RB7 to gnd), ...

I don't know why it is not working, I tried with 10pF and 27pF load caps.

I tested with 1mhz and 2mhz crystals, but it doesn't work. I think timer1 can only work with 32khz crystal.

I'm starting to think that I made a big mistake choosing this PIC without interrupt prefe ...

Thanks very much for your replies. I will work more on the code.

But the main problem is still there, timer1 interrupts still making mcu to wake up slow.
I want to try a new idea, use 1mhz crystal ...

Clear code:

#define USB_HW_CCS_16F1459
#include <16LF1459.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP ...

Yes, timer log is written to external SPI flash.

I don't think writing to memory is the issue. First: ON Led, Second: Copy to memory.

If I disable timer1 during sleep, it wakes-up very fast, and ...

Sorry, I don't know how to use many functions yet.

I want timer1 running all time, and when I press the button, MCU has to wake up, ON a led, and write current timer in the memory.

Hi, I've been working on it since last week, and I don't find a solution yet.

This code is working, the only issue is the delay for detecting the interrupt when the timer1 is working. If timer1 is ...

CCS compiler 5.015

timer1 is working from external crystal,32.768k, 2 seconds the interrupt works.

Please see the Sleep area code.

This is what I made first:

if(time_sleep>=2)
...

The timer will then be serviced.
I don't understand this. Now timer1 stops during sleep.

However if you want the timer routine to update, the timer routine needs to be called sometime.
It is in s ...

Hi Ttelmah,

I did as you said, but timer1 stopped working inside sleep mode when disabled global interrupt. Any idea ?

Thanks again for your help.
I will try that.

By the way, this is neither USART nor spi, right ?

I'm sorry, I explained myself very bad. I'm very new to PIC programming and I'm experimenting with things harder than my level. I really appreciate all replies.

To read data from the buffer memory: ...

Well, I'm using SPI to connect PIC to SPI flash. Which needs 4 wires: CS, SDI, SDO, and SCK.

And the sensor only has 2 wires: data (output of the sensor), and strobe (input of the sensor). I think ...

This is a multi-axis sensor with data buffer.
Data sheet is not public, but the idea is quite simple, to extract information from buffer I have to send strobe, and receive data.
Maximum strobe frequ ...