Download UM10601 LPC800 User manual

UM10601
NXP Semiconductors
Chapter 17: LPC800 SPI0/1
17.7.2 Frame delays
Several delays can be specified for SPI frames. These include:
•
•
•
•
Pre_delay: delay after SSEL is asserted before data clocking begins
Post_delay: delay at the end of a data frame before SSEL is deasserted
Frame_delay: delay between data frames when SSEL is not deasserted
Transfer_delay: minimum duration of SSEL in the deasserted state between transfers
17.7.2.1 Pre_delay and Post_delay
Pre_delay and Post_delay are illustrated by the examples in Figure 35. The Pre_delay
value controls the amount of time between SSEL being asserted and the beginning of the
subsequent data frame. The Post_delay value controls the amount of time between the
end of a data frame and the deassertion of SSEL.
3UH DQGSRVW GHOD\ &3+$ 3UHBGHOD\ 3RVWBGHOD\ 0RGH&32/ 6&.
0RGH&32/ 6&.
66(/
026,
06%
/6%
0,62
06%
/6%
3UHBGHOD\
'DWDIUDPH
3RVWBGHOD\
3UH DQGSRVW GHOD\ &3+$ 3UHBGHOD\ 3RVWBGHOD\ 0RGH&32/ 6&.
0RGH&32/ 6&.
66(/
3UHBGHOD\
06%
/6%
06%
/6%
'DWDIUDPH
3RVWBGHOD\
Fig 35. Pre_delay and Post_delay
UM10601
Preliminary user manual
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 24 January 2013
© NXP B.V. 2013. All rights reserved.
226 of 326