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GPIO in stop mode | Cypress Semiconductor

GPIO in stop mode

Summary: 2 Replies, Latest post by BMAH on 27 Jun 2013 04:41 PM PDT
Verified Answers: 1
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HiZ's picture
27 posts

 In stop mode all GPIO pins will be frozen. Can I change the pin status, after waking up from stop mode by a wake up reset?

HIMA's picture
Cypress Employee
169 posts

 After a wakeup reset, the GPIO states remain frozen, and must be unfrozen using the API  function CySysPmUnfreezeIo() before the pin states can be changed.

BMAH's picture
Cypress Employee
189 posts

Just adding one more point to this....It is not required to call CySysPmFreezeIo for Stop Mode, but is required for Hibernate Mode. If not , the IO-cells will be frozen in the same way as they are in the Active to Deep Sleep transition, but will lose their state on wake up (because of the reset occurring at that time).

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