
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
21 of 172
7.4.3.4 Baud rate change (HSU)
Additionally to the window size and the endpoint capabilities another optional parameter
is introduced on the Host interface. This parameter identifies the baud rate used for the
HSU interface. The frame on the host side looks now as follows:
(1) 2
≤
nnnn nnnn
≤
4
(2) 0
≤
pppp pppp
≤
9
(3) Endpoint capabilities are not used in host direction
Fig 12. Baud rate Frame
Note:
It is highly recommended to only convey the HSU baud rate if the baud rate
shall be changed. Otherwise the HSU baud rate field should not be sent in order to save
power, processing time and EEPROM write cycles.
The baud rate is stored in non-volatile memory, which means that the set baud rate
persists even after a reset or a power-down and power-up phase.