some queries about MCU simulator

[PG1995]

Hi

In the linked video below I have asked some questions, please help me with them. Thank you.

https://www.youtube.com/watch?v=f16KFnXMmCI

Regards
PG

PS: At the start of the video I wanted to say: I think the row 00 corresponds to the RAM's registers R0, R1, etc.

 

[Ian Rogers]

Hi PG... The 06 is in R0 bank 2... There is four banks.... The 0x06 is the return address of the delay call.

To view the banks, there are two page select bits (similar to the pics) called RS1 and RS0 in the PSW.. These Register Select bits determine which register bank you're in The are red (off ) green (on).

Not sure about the memory, I use the 89C52 and it has 256 bytes of ram

 

[PG1995]

Hi PG... The 06 is in R0 bank 2... There is four banks.... The 0x06 is the return address of the delay call.

To view the banks, there are two page select bits (similar to the pics) called RS1 and RS0 in the PSW.. These Register Select bits determine which register bank you're in The are red (off ) green (on).

Not sure about the memory, I use the 89C52 and it has 256 bytes of ram

Hi Rogers

Thanks a lot for the help.

Isn't it in R0 in Bank 1 instead of Bank 2 (at least the diagram in my book shows this like this for 8051)? Please let me know. Thanks.

Regards
PG

 

[Ian Rogers]

I don't think all variants have the ghost registers R0 - R7 in bank two three and four. So what you are seeing is the stack, I've read through the datasheet and the stack starts at location 8 on this chip

 

[PG1995]

Hi again

The book doesn't seem to agree with you! It doesn't matter if it's bank 2 or whatever because at least now I understand what it is and thank you for telling me this.

Regards
PG

 

[Ian Rogers]

Hi again

The book doesn't seem to agree with you! It doesn't matter if it's bank 2 or whatever because at least now I understand what it is and thank you for telling me this.

Regards
PG

Sorry about that... But the point was there is 4 register banks and the second bank( bank1) is the start of the stack. I was calling the first bank.. bank1 instead of 0.