Showing results for 
Search instead for 
Did you mean: 

Knowledge Base Articles

Glitch while Changing P or Q of CY22393

Not applicable

Glitch while Changing P or Q of CY22393

Question: 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.

Version history
Revision #:
1 of 1
Last update:
‎Sep 26, 2009 06:58 PM
Updated by: