topic Stack size in 8-bit Microcontrollers

Stack size

Brax02 — Tue, 17 Dec 2013 15:20:12 GMT

I have a question regarding the stack in the MC9S08SG16

The total size RAM is 1024 bytes. It starts from the address 0x80 until 0x047F.

To initilized the stack pointer I used the follwing asm cmd

LDHX #RamEnd+1 ;point one past RAM

TXS ;SP<-(H:X-1)

In the file MC9S08SG16.inc RamEnd is defined like that :

RAMEnd: equ $0000027F

My question is why it's not $0000047F ?

Jorge_Gonzalez — Fri, 20 Dec 2013 00:00:32 GMT

Hello Brax02:

Where did you get that include file? I assume it was included automatically by some of the CodeWarrior versions maybe?

I checked the file included with CodeWarrior v10.5 and it actually indicates the next:

RAMEnd:

equ $0000047F

I attach here the file I am talking about so you can compare it with the one you have.

Hope this is useful!

/Jorge Gonzalez

Brax02 — Mon, 06 Jan 2014 12:10:53 GMT

Hello Jorge,

Thanks for your answer !

Yes the file is automatically included. I used the CodeWarriorIDE version 5.9.0

It's probably a mistake.

Jorge_Gonzalez — Mon, 06 Jan 2014 16:01:15 GMT

Hello:

No problem. Yes, it was likely an error with the included file . You may use the one I attached.

Regards :smileyhappy:

/Jorge Gonzalez