There is microcontroller for 2 inputs edge capture ?

• Mar 16, 2004

• #2

nbucska

Electrical

Jun 1, 2000

2,191

US

How fast response do you require? Can you explain your requirements ?

<nbucska@pcperipherals.com>

 

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• Mar 16, 2004

• #3

sreid

Electrical

Mar 5, 2004

2,127

US

If you can use an additional IC you can clock a Flip Flop with your edge and clear the FF with an output bit.

 

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• Mar 16, 2004

• Thread starter
• #4

Lanfeust23

Electrical

Feb 16, 2004

20

CA

In fact, my 2 signals (from an ADXL202 accelerometer) are PWM signals with a periode of 1ms. Moreover, the 2 signals are 'synchronized' because they use the same triangle wave reference in the duty cycle modulator.
If I am unclear again, here is the link to the application note of Analog Devices I'm speaking about :

http://www.analog.com/UploadedFiles/Application_Notes/320058905AN604.pdf

 

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• Mar 16, 2004

• #5

nbucska

Electrical

Jun 1, 2000

2,191

US

I don't think you will be able to do real measurement:
I suggest calculate the required accuracy and I think
you will find that the ATMEL -- without additional hardware
is too slow.


<nbucska@pcperipherals.com>

 

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• Mar 16, 2004

• Thread starter
• #6

Lanfeust23

Electrical

Feb 16, 2004

20

CA

I calculated, and with an acceptable accuracy I fixed myself, a 1MHz clock for the microcontroller will be right.

 

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• Mar 18, 2004

• #7

logbook

Electrical

Sep 8, 2003

764

GB

1µs in 1ms is 1 part in 1000. That is not very great resolution.

Perhaps you could just use the analogue outputs into a PIC chip with dual 10 bit DACs.

 

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• Mar 22, 2004

• Thread starter
• #8

Lanfeust23

Electrical

Feb 16, 2004

20

CA

I know it's not a very great resolution but I think it will be enough. In fact,I can't do much better because after I will send information by RF (I need wireless application) and I'm limited by its bandwith (only 5kps).

 

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• Mar 25, 2004

• #9

felixc

Electrical

Feb 4, 2003

468

CA

Have a look at the Zilog Z8encore! I think it has three capture channels. The development system is almost free.

 

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• Mar 29, 2004

• #10

Emmet

Electrical

Apr 22, 2002

10

CA

The Motorola 68HC11, DSP56800, DSP56300 series processors will all do what you need (assuming I understand your requirements correctly).

 

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