MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 419
MMC2114
Manufacturer Part Number
MMC2114
Description
M CORE Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MMC2114.pdf
(654 pages)
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MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
NOTE:
Clock skew between the master and slave can cause data to be lost
when:
The synchronized SS signal is synchronized to the SPI clock.
18-13
SPI clock cycle late. While the synchronized SS of the slave is high,
writing is allowed even though the SS pin is already low. The write can
change the MISO pin while the master is sampling the MISO line. The
first bit of the transfer may not be stable when the master samples it, so
the byte sent to the master may be corrupted.
Figure 18-13. Transmission Error Due to Master/Slave Clock Skew
•
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
CPHA = 0, and,
The baud rate is the SPI clock divided by two, and
The master SCK frequency is half the slave SPI clock frequency,
and
Software writes to the slave SPIDR just before the synchronized
SS signal goes low.
shows an example with the synchronized SS signal almost a full
Serial Peripheral Interface Module (SPI)
Go to: www.freescale.com
SS SYNCHRONIZED
SCK (CPOL = 0)
SCK (CPOL = 1)
TO SPI CLOCK
MOSI/MISO
CHANGE O
CHANGE O
SPI CLOCK
SAMPLE I
MOSI PIN
MISO PIN
SS PIN (I)
MISO PIN
SPIDR WRITE
THIS CYCLE
Serial Peripheral Interface Module (SPI)
Functional Description
Advance Information
Figure
419
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