lpc 932 microcontroller

hello sir,
i am an udergraduate student, currently doing my project on lpc932 microcontroller as part of my academic curriculum.

i am using flash magic and keil for the project, i am also using the break detect uart method for isp programming.

i am trying to sample the ir remote signal using the external interrupt feature .
i am trying to sample the data at 10 microseconds,the data being obtained at the output pin of a 3 pin tsop11xx sensor,
it seems that interrupt is happening at random times, and the timing is incorrect.

i am using the internal RC oscillator.

please send any onformation in this regard

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