AVR-Chat

I am working on on a system to record temperature on a flash memory at a  programmed rate.
As there is nothing to be done between samples (1 Sec- 15 Mins) and it is battery powered I want it to sleep between samples.

I am using Mega 16, A/D MCP3550 on Spi, running on 3.6864 Mhz Crystal.

The first step I did was to read from A/d and send it by uart to check readings, it was ok.

When I started to introduce sleep, I got zeros received by uart! even the number of bytes sent.
So I conclude that the problem is when waking after the sleep, is there any thing that I missed or settings to be done so that I get it work as I want it?

Code Bellow.

Thanks,
Moataz Hussein

;/////////////////
; Timer2 overflow
;/////////////////

Timer2_Ovf:

 clr temp  ; Disable sleep
 out mcucr,temp

 dec temp1  ; Loops counter
 brne hh

 ldi temp1, 225  ; Reset Counter value to 225 when done

hh:
 ldi Temp,LOW(Sec1) ; After interupt completed go back to Sec1
 push Temp
 ldi Temp,HIGH(Sec1)
 push Temp
 reti

;/////////////////
; Main
;/////////////////

Main_sample:

 rcall sample   ; Read from A/d And send by UART

 sei
 ldi temp, 0b01000000
 out timsk, temp

 Ldi Temp, 0b00000100 ; Prescaller 64
 out tccr2, temp
 ldi temp1, 225  ; No of loops to get 1 Sec



TMRLOOP:

 ldi temp,0b01010000 ; Enable sleep, mode
; out mcucr,temp
 sleep 
 Rjmp TMRloop

Sec1:
 Ldi temp, 225
 cpse temp, temp1
 rjmp tmrloop
 
 Rjmp Main_sample

[Non-text portions of this message have been removed]