9 motorola spi format with spo=1, sph=0, 9 motorola spi format with spo=1, sph=0 -8, With spo=1 and sph=0 -8 – Cirrus Logic EP93xx User Manual
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DS785UM1
Copyright 2007 Cirrus Logic
Synchronous Serial Port
EP93xx User’s Guide
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23.5.9 Motorola SPI Format with SPO=1, SPH=0
Single and continuous transmission signal sequences for Motorola SPI format with SPO=1,
SPH=0 are shown in
Figure 23-6. Motorola SPI Frame Format (Single Transfer) with SPO=1 and SPH=0
Note: In
, Q is an undefined signal.
Figure 23-7. Motorola SPI Frame Format (Continuous Transfer)
with SPO=1 and SPH=0
In this configuration, during idle periods
•
the SCLKOUT signal is forced HIGH
•
SFRMOUT is forced HIGH
•
the transmit data line SSPTXD is arbitrarily forced LOW
•
when the SSP is configured as a master, the SSPCTLOE line is driven LOW, enabling
the SCLKOUT pad (active LOW enable)
•
when the SSP is configured as a slave, the SSPCTLOE line is driven HIGH, disabling
the SCLKOUT pad (active LOW enable).
4 to 16 bits
MS B
LS B
LS B
Q
MS B
SSPTXD
SSPOE
SSPRXD
SFRMOUT /
SFRMIN
SCLKOUT /
SCLKIN
MS B
LSB
LS B
MS B
4 to 16 bits
SSPOE (=0)
SSPRXD
SSPTXD /
SFRMOUT /
SFRMIN
SCLKOUT /
SCLKIN