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@srizf thank you dear ... actually for each incoming low pulse of 1usec, it has to generate only one low pulse of 2usec duration
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@KlausST @BradTheRad thanks dear actually a low pulse of 1us is being sent to external interrupt of 8052 (active low interrupt configured)...
i have an input signal which goes active state (high or low) for 1usec and remain idle state (low or high) for the rest of the time ...
i want to put a delay in its active 1usec pulse . such that output has 2usec active state . i dont want to use microcontroller here , just want to achieve this...
i have used internal watchdog timer of At89c5131 clock at 8Mhz with X2=0; that means peripheral clock= (8/6) MHz ....
by setting watch dog counter to maxium setting of 7 ... i.e. 16384*S^2 machine cycles gives watch dog time aprox 3.1 sec where as i want upto 4.5 sec
is there any scheme/logic...
thanks FvM actually m still in beginner mode thats y i needed a direction ... thaks alot for ur help ... i have implemented 19200 and 38400 baud rates :-) now i m moving on spi , will seek ur help again :-)
it is the issue of flip software as it worked on 16Mhz , and it uses 3 oscilator options for burning i.e. 8,16,32 ....
thats y it was not working on other oscilators. . btw thank ud23 :-)
dear FvM!
if u r referring to SMOD1 methodology then i did that but if there is some other way then please let me know i could not understand via datasheet and 8051 book.
dear ud23 !
yeah i did that for 2400 baud rate and got upto 4800
as for 2400 baud rate TH1= 247.3 hence after truncation it comes TH1=247 i.e.
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dear ud23!
yeah i did that earlier but i can go upto 4800 baud rate .. beacuse
for 2400 baud rate TH1= 247.3 , after truncation...
i m using at89c5131 @8MHz and i want to communicate via uart ...
but the actual baud rates after calculations are coming to
baud rate | value to be put in TH1 register | TH1 (8bit register)
-------------------------------------------------------------
4800 | 251.659...
thanks ud23 for ur reply,
actually i have 2 issues, one is that the circuit board (having AT89C5131) is detected by flip software via usb only if i use 8Mhz oscillator . why is it so ?
2nd issue is that if i have to use 8Mhz then how to deal with baud rate? because at 8Mhz baud rate error...
my AT89c5131 is being properly detected by FLIP via usb , after applying hardware conditions via board ... but this is only when 8Mhz oscillator is used in the circuit
when i replace 8Mhz by 11.0592Mhz , the microcontroller is not detected after applying hardware conditions.
whenever i need...
A very basic question:
what are the registers settings required to enable internal clock of AT89C5131?
is it just defining FOSC with the clock speed ?
kindly rep asap ...
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