OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 237

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

NXP Semiconductors
UM10441
User manual
12.7.3.1 Setup and hold time requirements on CS with respect to SK in Microwire
mode
In the Microwire mode, the SSP slave samples the first bit of receive data on the rising
edge of SK after CS has gone LOW. Masters that drive a free-running SK must ensure
that the CS signal has sufficient setup and hold margins with respect to the rising edge of
SK.
Figure 36
edge on which the first bit of receive data is to be sampled by the SSP slave, CS must
have a setup of at least two times the period of SK on which the SSP operates. With
respect to the SK rising edge previous to this edge, CS must have a hold of at least one
SK period.
Fig 35. Microwire frame format (continuos transfers)
Fig 36. Microwire frame format setup and hold details
CS
SO
SK
SI
illustrates these setup and hold time requirements. With respect to the SK rising
All information provided in this document is subject to legal disclaimers.
LSB
CS
SK
SI
0
MSB
Rev. 1.1 — 10 March 2011
output data
4 to 16 bit
LSB
MSB
t
HOLD
8 bit control
= t
SK
t
SETUP
Chapter 12: LPC122x SSP controller
=2*t
SK
LSB
MSB
output data
4 to 16 bit
UM10441
© NXP B.V. 2011. All rights reserved.
LSB
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