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LPC2148 interrupt doubt

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kandhu26

kandhu26

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i am using 0.30 pin as external interrupt...when i am pressing the switch[interrupt switch] it will go to 5V.[becoz in circuit normally pull down with resistor when the switch is pressed it will go to 5V].first 20 times it was working properly[interrupt was generated]..then suddenly the interrupt is not working[the pin{0.30} itself gone]...my doubt is should i produce interrupt using 5V here...
 

Most I/O pins of the LPC2148 are 5V tolerant, so that would work. Pressing an interrupt button could however start that interrupt many times if it is level triggered.

You should NOT use 5V if the MCU is not power with 3V at the same time. 5V tolerance is only during active mode of the MCU, meaning 3V has to be present for the I/O to tolerate 5V. (Check datasheet)

hth, Bob
 

Hi

Not sure how your software works - but you need to free the interrupt by reseting its vector

This might be one source of your problem

All the best

Bobi

The microcontroller specialist
 

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