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MPC860TZQ80D4

Question asked by Dany Bourget on Oct 15, 2015
Latest reply on Oct 30, 2015 by alexander.yakovlev

We've been using the MPC860TZQ80D4 for many years in one of our product without having any trouble. Now we have two boards with the same problem. When I power up the unit the first time, everything works fine. After 1 minute, if I power down the unit and then power it up the MPC860TZQ80D4 stuck in an infinite loop (time base instruction). If I compare the EXTCLK with the CLKOUT I could see a phase shift (see attachment). Could it be a PLL problem? If I place a 8pF scope probe on the EXTCLK signal the processor starts correctly every single time.

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