Why does the assembly code sometimes store the register values into RAM and sometimes not?

I have two pieces of code that are very similar. Both of the code are compiled with the `-O0` flag in AC5. When I look at the assembly of the first code, I found that some variables loaded into registers...
Why does the assembly code sometimes store the register values into RAM and sometimes not?

I have two pieces of code that are very similar. Both of the code are compiled with the `-O0` flag in AC5. When I look at the assembly of the first code, I found that some variables loaded into registers...
ABout Storing data in Nonvoliate ram

I am using the DS1643 which contain both non voliate ram and a RTC. also, in my project, i use the timer 1 interrupt to counter the machine operation time: unsigned char second, min, hour; i use...
Storing data at Specific RAM address

Hi all I want to store my data used in the code at a particular specific address in RAM of the chip how can i do it . i tried to this but got data abort error #define test ((*volatile unsigned...
ABout Storing data in Nonvoliate ram

I am using the DS1643 which contain both non voliate ram and a RTC. also, in my project, i use the timer 1 interrupt to counter the machine operation time: unsigned char second, min, hour; i use...