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MPC860 PIT problem

Question asked by Abdellah HADJ-RABAH on Aug 26, 2016
Latest reply on Aug 30, 2016 by alexander.yakovlev

Hello colleagues,

I use the Periodic Interrupt Timer of the MP860 with the EXTCLK source and a Prescaler of 512 ( MODCK [1:2] =10).

 

When the power supply 3V3 of the MPC860 rises sharply (7 to 10 ms), the Timer Interrupt is correctly generated and the main program is executed correctly.

 

When the power supply 3V3 of the MPC860 rises slowly (30 to 40 ms), the Timer Interrupt is never generated but the main program is executed correctly. It's as if the internal clock PITRTCLK isn't generated in the chip.

 

The exact reference of the MPC860 is MPC860DEVR80D4 with  a date code of  September 2011.

 

Has anyone heard of dysfunctions of the PIT depending of the slope of the 3V3 power supply ?

I check the MPC860 datasheet and I didn't find any specifications about the slope of the 3V3 power supply. 

Best regards. 

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