byte allocation for numbers in EEPROM

deepakomanna · Joined: 06 Mar 2007 Posts: 92 Location: Pune,India

Dear sir,
Here i am using 16f913 device, & compiler 4.073 v
So if i want to store numbers < 255 I have to allocate 1 byte of EEPROM.
Then if i want to store number 60000 or above how much byte i have to allocate to store this number in EEPROM.
Because 1 location will store 1 byte of data,so data range is 0 to 255
& if i am using 2nd location data range is 256 to 512 or till 65535.
please clear my knowledge.
_________________
Thank You,
With Best Regards,
Deepak.

Ttelmah · Guest

Look in the help file. Contents - Data definitions - Basic types. What does it show that you can hold in an unsigned int16?.
Now do a search here, and you will find lots of threads about how to store these larger types (particularly about floats, but the same answers apply for int16), into the EEPROM.
Hopefully, you can find what you need from these sources. Come back if you have trouble.

Best Wishes

Wayne_ · Joined: 10 Oct 2007 Posts: 681

I wonder how many people will have ignored this question. This is basic progamming knowledge you should already know.

Basically it is the number of bits that determin the size of the value you can store.
8 bits (1 byte) = 0 to 255
16 bits (2 bytes) = 0 to 65535
32 bits (4 bytes) = 0 to 4294967295

basically 2^bits is the size but the range is 0 to (2^bits - 1)
2^8 = 256 but 0 is counted as 1 so you can store a value from 0 to 255.

Hope this helps.

deepakomanna · Joined: 06 Mar 2007 Posts: 92 Location: Pune,India

Actually my question is,
If i want store number at "00 location" max number is 255,OK
& if i want to store number at " 00 & 01 location" max number can be possible is " 512 or 65535."
_________________
Thank You,
With Best Regards,
Deepak.

Ttelmah · Guest

Your question has already been answered.....
As Wayne says, it is very 'basic', which is why I said 'read the manual'....
He has put the answer in his reply.
Think of it like a calculator display. If somebody said 'my calculator can display 8 digits, what is the biggest number it can display', the reply would be 'count them'. Mathematically, the answer is (10^8)-1. This is exactly how it works with binary values (and the bytes normally used to hold them). (2^NumberOfbits)-1.

Best Wishes