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Glitch while Changing P or Q of CY22393 | Cypress Semiconductor

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Glitch while Changing P or Q of CY22393

Last Updated: December 28, 2011

Why is switching to other output frequencies not glitch-free when P or Q values are changed?


The reason for switching the clock outputs off or changing the source to the reference is because the serial programming bits take effect right after the acknowledge pulse is sent. Since the P and Q values are stretched out over 3 bytes, the PLL could go into an illegal state and output an unusable signal during I2C shifting. There is a possibility of glitching when switching the output off or changing it to the reference.

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