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41.5.31 Global time base (GTB)
The global time base (GTB) is a FTM function that allows the synchronization of
multiple FTM modules on a chip. The following figure shows an example of the GTB
feature used to synchronize two FTM modules. In this case, the FTM A and B channels
can behave as if just one FTM module was used, that is, a global time base.
GTBEOUT bit
gtb_in
gtb_out
gtb_in
example glue logic
FTM module B
FTM module A
GTBEEN bit
FTM counter
enable logic
FTM counter
enable
gtb_out
Figure 41-113. Global time base (GTB) block diagram
The GTB functionality is implemented by the GTBEEN and GTBEOUT bits in the
CONF register, the input signal gtb_in, and the output signal gtb_out. The GTBEEN bit
enables gtb_in to control the FTM counter enable signal:
• If GTBEEN = 0, each one of FTM modules works independently according to their
configured mode.
• If GTBEEN = 1, the FTM counter update is enabled only when gtb_in is 1.
In the configuration described in the preceding figure, FTM modules A and B have their
FTM counters enabled if at least one of the gtb_out signals from one of the FTM modules
is 1. There are several possible configurations for the interconnection of the gtb_in and
gtb_out signals, represented by the example glue logic shown in the figure. Note that
these configurations are chip-dependent and implemented outside of the FTM modules.
See the chip-specific FTM information for the chip's specific implementation.
NOTE
• In order to use the GTB signals to synchronize the FTM
counter of different FTM modules, the configuration of
each FTM module should guarantee that its FTM counter
starts counting as soon as the gtb_in signal is 1.
• The GTB feature does not provide continuous
synchronization of FTM counters, meaning that the FTM
counters may lose synchronization during FTM operation.
Functional Description
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
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NXP Semiconductors
Содержание MWCT101 S Series
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