Cirrus-logic EP93xx Manual do Utilizador Página 720

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23-8 DS785UM1
Copyright 2007 Cirrus Logic
Synchronous Serial Port
EP93xx User’s Guide
2
3
2
3
23
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 and Figure 23-7.
Figure 23-6. Motorola SPI Frame Format (Single Transfer) with SPO=1 and SPH=0
Note: In Figure 23-6, 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).
4to16bits
MS B
LS
B
LS B
QMS B
SSPTXD
SSPOE
SSPRXD
SFRMOUT /
SFRMIN
SCLKOUT /
SCLKIN
MS B LSB
LS B MS B
4to16bits
SSPOE (=0)
SSPRXD
SSPTXD /
SFRMOUT /
SFRMIN
SCLKOUT /
SCLKIN
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