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Questions about capacitor and powerdown mode in 89c2051

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microlab

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dear friends

what will happen if we do not connect the capacitor from reset pin to +Vcc?
is there any documents related to power down mode of 8051 is available?
i would like to know more about the cold boot and warm boot
and other aspects about the power down mode

thanking you

ml
 

89c2051 reset capacitor

hi,

The capcitor maintains the logic high at the reset pin to avoid false reset when power supply dips for a few micro secs.

Its is recommended that the RC time constant be equal to atleast 100 machine cycles to guarantee a quality reset.
 

89c2051 power down

Wrong!
The capacitor actually give reset pulse at power ON.
 

reset cho 89s2051

dear friends

thank you for the reply
in at 89c2051 the capacitor is connected to +vcc
any body can get me more about the idle and powerdown modes of at 89c2051?
and about cold reset and warm reset?

regards

ml
 

89c2051 powerdown

Hi,

i have mentioned that RC constant to be equal to 100 Machine cycles which for the reset pulse.
 

89c2051

not sure !!! but little bit i know 2051 have pwr dwn and cold boot and warm boot
you can verify by downloading datasheet form atmel website.
 

Re: 89c2051

Hi,
Please read **broken link removed**for details, but you can avoid all these problems if you can use the latest 89S2051,which recovers from power down mode with external interrupts, in which case, the controller working environments are not changed and it truly lands up after a long sleep as if nothing has happened.
Regards,
Laktronics
 

89c2051

capacitor and resistor in reset pin perform power up reset.by starting theciruit capacitor is decharge (vc=0)so vcc drop on reset.then capasitor charge and after 5t(t=r*c)vc reach to vcc so voltage drop on reset pin=0 so with starting the circuit uc reset and then go in normal mod.
 

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