Is the Assembler 'sleep' command the same as BASCOM Powerdo

TSEYFARTH · Joined: 01 Jul 2006 Posts: 1054

Hello all,

Can anyone tell me if the Asm code, "sleep" is the same as MCS BASCOM "Powerdown"?

If not, can anyone tell me how to modify Everts asm code to emulate the Powerdown command of MCS BASCOM?

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

sleep is an assembler mnemonic.
powerdown uses sleep too. All sleep modes require to set some bits in a register in a special sequence and end with the sleep instruction.
it differs from chip to chip.

TSEYFARTH · Joined: 01 Jul 2006 Posts: 1054

Hi Mark,

I am using an Atmega 168PA. I was using the BASCOM command "powerdown". But I wanted to also turn off the BOD. I found a thread wherein Evert wrote the asm code I included in the original post. I wanted to be sure that the effect of using the assembler mnemonic command 'sleep' was the same as the powerdown command built into BASCOM.

Tim

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

please stick to bascoms config power= . it is really the best for you to do.
or take time to read the data sheet. the MCUCR register in the mentioned chip is totally different. as far as i can see the bod can only be turned off by the fuse bits in the m168.
Table 10-1 in the pdf lists the various power modes.

laborratte · Joined: 27 Jul 2005 Posts: 299 Location: Berlin

Hi.
The M168PA is a picoPower device and supports BOD software disable. The mechanism for enabling is identical to the chip Evert was using.
The sleep mode which is executed by the sleep instruction depends on SMCR (sleep mode control register). See datasheet chapter 10 for details.

For your specific mode and chip the assemble instructions could be as follow:

TSEYFARTH · Joined: 01 Jul 2006 Posts: 1054

Hi laboratte,

Yes, I know it was the same family and supports this feature. I just wanted to be sure that the sleep command is the same as the BASCOM sleep. Previously, I was using only the built in commands. I started looking into turning off BOD as saw the thread on the forum - discussing the timing issues and the necessity to use asm - which I have not a clue about coding.

I see the differences you made and thank you. I had not tested either yet but plan to today.

One thing, can you tell me what r25 means?

Thank you again,
Tim

laborratte · Joined: 27 Jul 2005 Posts: 299 Location: Berlin

r25 is one of 32 general purpose registers of the CPU. Nearly every data transfer and caluculation has to be done with these registers. For details see Chapter 7 of 168PA's datasheet.

TSEYFARTH · Joined: 01 Jul 2006 Posts: 1054

Thanks will do!
Tim

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

Sorry, i had the wrong PDF open. Laboratte is right. The P(A) indeed supports this for some of the sleep modes. it is probably a good idea to add this option.

TSEYFARTH · Joined: 01 Jul 2006 Posts: 1054

Thanks for the confirmation Mark.

Have a wonderful evening!
Tim