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TC1728
Synchronous Serial Interface (SSC)
switching modes. Port pins assigned as SSC I/O lines can be controlled either by
hardware or by software.
When the SSC I/O lines are connected to dedicated pins, hardware I/O control should
typically be used. In this case, two output signals reflect the state of the CON.EN and
CON.MS bits directly (the M/S select line is inverted to the CON.MS bit definition).
When the SSC I/O lines are connected with bi-directional lines of general purpose I/O
ports, software I/O control should be typically used. In this case port registers must be
programmed for alternate output and input selection. When switching between master
and slave mode port registers must be reprogrammed.
Using the open-drain output feature of port lines helps to avoid bus contention problems
and reduces the need for hard-wired hand-shaking or slave select lines. In open-drain
output mode, it is not always necessary to switch the direction of a port pin. Note that in
hardware-controlled I/O mode, the availability of open-drain outputs depends on the type
of the dedicated output pins that are used. The SSC module itself does not provide any
control capability for open-drain control.
Note: For details of SSC port connections and configuration, see
Page
18-53.
User's Manual
18-13
V1.0, 2011-12
SSC, V1.41 2010-06
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