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reached, a register reload will only occur if LDOK bit is enabled. The reload flag (RF)
and initialization trigger generation are independent of LDOK bit. The table below shows
which are the reload opportunities.
Table 39-18. When possible reload opportunities are enabled
Loading point
Enabled
When a counter event happens. See
Always
At the channel (j) match (FTM counter = C(j)V)
When CHjSEL = 1
At the Half cycle event match (FTM counter = HCR)
When HCSEL = 1
The figure below shows a simplified representation of the reload logic. The Reload Flag
(RF) can be used to generate an external interrupt when a load point is reached. It is also
possible to generate an initialization trigger and a register reload when a load point is
reached. Note that Load Frequency configuration can modify the RF generation.
half cycle match
HCSEL
counter event
channel 0 match
CH0SEL
channel 1 match
CH1SEL
channel (n) match
CH(n)SEL
Load Freq.
Counter
(RF)
Initialization trigger
Reload interrupt
Reload
flag
reload
opportunities
reload
point
Enable
Logic
Enable
Logic
Enable
Logic
Registers reload
Figure 39-100. Registers reload logic
The following figure shows some examples of enabled reload opportunities when counter
is in up counting mode. Note that the example below also uses a channel match as reload
opportunity, but generally applications uses only the half cycle match if a non full cycle
reload is needed.
Chapter 39 FlexTimer Module (FTM)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
987
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