Pls help me about Idle and Power Down mode of AT89C51 chip !

[member_tdh]

example power down at89c51

Hi all member!!!
I have a project which need to save power.I still understand about it. Pls help me!!!

 

[bobcat1]

Re: Pls help me about Idle and Power Down mode of AT89C51 ch

Hi

You can read all about it on the data sheet

Basicly there is 2 mode idle - mode wher osc and int still work and processor consum several mA and Power down mode wher everithing shutdown and current consumption go below 10uA

You can invoc PD mode by writing to PCON register


All the best

Bobi

 

[member_tdh]

Re: Pls help me about Idle and Power Down mode of AT89C51 ch

Thanks!!!
I have used Idle mode. PCON=0x01; (bit IDL=1).My sys working in Idle mode but has a problem: system is not back to first status until i reset system by hardware (button ReSet on 9 pin of AT89C52).
I want to know how wake up from Idle mode (clear bit IDL=0)???
Can you help me???

if (PCON&=0x01)
{

}
else if (PCON=0x00) // how ???
{

}

 

[SphinX]

Salam,

There are two methods only for wakeup from IDLE mode

1- By hardware reset
2- By enabled interrupt

PCON.0 (IDL flag) is cleared by hardware when uC wakeup.
The uC is resume execution from the point after you set IDL

Example

PCON = 1; // Enter IDLE MODE
++x; // On resume by hardware reset or Interrupt (after ISR execution)


Bye

 

[member_tdh]

Re: Pls help me about Idle and Power Down mode of AT89C51 ch

still have a problem with IDLE mode.

 

[member_tdh]

Re: Pls help me about Idle and Power Down mode of AT89C51 ch

Thanks all friends!!!
I have successed!!!