OM13013,598 NXP Semiconductors, OM13013,598 Datasheet - Page 234
OM13013,598
Manufacturer Part Number
OM13013,598
Description
BOARD DEMO IAR LPC1227 JLINKLITE
Manufacturer
NXP Semiconductors
Series
-r
Specifications of OM13013,598
Design Resources
LPC122x-SK Brd Schematic
Processor To Be Evaluated
LPC1227
Processor Series
LPC122x
Data Bus Width
32 bit
Interface Type
UART, SSP, SPI, I2C
Cpu Core
ARM Cortex-M0
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
3 V to 3.6 V
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-6885
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UM10441
User manual
Fig 32. SPI frame format with CPOL = 1 and CPHA = 0 (a) Single and b) Continuous Transfer)
a. Single transfer with CPOL=1 and CPHA=0
b. Continuous transfer with CPOL=1 and CPHA=0
SSEL
MOSI
MISO
SCK
MSB
MSB
In this configuration, during idle periods:
If the SSP is enabled and there is valid data within the transmit FIFO, the start of
transmission is signified by the SSEL master signal being driven LOW, which causes
slave data to be immediately transferred onto the MISO line of the master. Master’s MOSI
pin is enabled.
One half period later, valid master data is transferred to the MOSI line. Now that both the
master and slave data have been set, the SCK master clock pin becomes LOW after one
further half SCK period. This means that data is captured on the falling edges and be
propagated on the rising edges of the SCK signal.
In the case of a single word transmission, after all bits of the data word are transferred, the
SSEL line is returned to its idle HIGH state one SCK period after the last bit has been
captured.
However, in the case of continuous back-to-back transmissions, the SSEL signal must be
pulsed HIGH between each data word transfer. This is because the slave select pin
freezes the data in its serial peripheral register and does not allow it to be altered if the
CPHA bit is logic zero. Therefore the master device must raise the SSEL pin of the slave
device between each data transfer to enable the serial peripheral data write. On
completion of the continuous transfer, the SSEL pin is returned to its idle state one SCK
period after the last bit has been captured.
•
•
•
The CLK signal is forced HIGH.
SSEL is forced HIGH.
The transmit MOSI/MISO pad is in high impedance.
SSEL
MOSI
MISO
SCK
4 to 16 bit
All information provided in this document is subject to legal disclaimers.
MSB
Rev. 1 — 15 February 2011
LSB
LSB
MSB
Q
4 to 16 bit
MSB
MSB
LSB
LSB
Chapter 12: LPC122x SSP controller
Q
4 to 16 bit
UM10441
© NXP B.V. 2011. All rights reserved.
LSB
LSB
Q
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