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MC9S08LL16 Reset signal after power on

Question asked by Yanbin Zhao on Jan 11, 2017
Latest reply on Jan 13, 2017 by Yanbin Zhao

I want to program the MC9S08LL16 FLASH using BKGD pin.

Now when I power on the MC9S08LL16, the pin RESET will output an periodical low pulse with width 8.4us , and the gap about 34.8us(43.2-8.4). The attachment IMG_20170111_135006.jpg, IMG_20170111_135024.jpg are related waveforms.  Does anyone know why this happen?