NXP Semiconductors PN544 C2 - Clock Request Using HCI Event; Clock Request & Release

NXP Semiconductors
UM191812
PN544 C2 User Manual
191812 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
User Manual Rev. 1.2 — 2010-06-16 60 of 172
9.4.2.2 Clock Request using HCI Event
The followi
ng figures show the 2 possible use of HCI Event for Clock Request &
acknowledge:
1
3
2
(1)
Fig 34. Clock request with HCI Event, acknowledge with HCI Event
1
3
2
(1)
Fig 35. Clock request with HCI Event, acknowledge with Timeout
Note: Step2 means that system clock is stable and available for PN544.
9.4.3 Clock Request & Release
There are 3 ways to setup the clock request.
WARNING: Clock request/acknowledge mechanism is not available with HSU link.
When PN544 is in HSU mode, the ‘No clock request’ setup must be chosen. HSU
mode imposes System clock always present.