3.8.2.2 External Clock Options
By default each FTM is clocked by the internal bus clock (the FTM refers to it as system
clock). Each module contains a register setting that allows the module to be clocked from
an external clock instead. There are two external FTM_CLKINx pins that can be selected
by any FTM module via the SIM_SOPT4 register.
3.8.2.3 Fixed frequency clock
The fixed frequency clock for each FTM is MCGFFCLK.
3.8.2.4 FTM Interrupts
The FlexTimer has multiple sources of interrupt. However, these sources are OR'd
together to generate a single interrupt request per FTM module to the interrupt controller.
When an FTM interrupt occurs, read the FTM status registers (FMS, SC, and STATUS)
to determine the exact interrupt source.
3.8.2.5
FTM Fault Detection Inputs
The following fault detection input options for the FTM modules are selected via the
SIM_SOPT4 register. The external pin option is selected by default.
• FTM0 FAULT0 = FTM0_FLT0 pin or CMP0 output
• FTM0 FAULT1 = FTM0_FLT1 pin or CMP1 output
• FTM0 FAULT2 = FTM0_FLT2 pin
• FTM0 FAULT3 = FTM0_FLT3 pin
• FTM1 FAULT0 = FTM1_FLT0 pin or CMP0 output
• FTM1 FAULT1 = CMP1 output
• FTM2 FAULT0 = FTM2_FLT0 pin or CMP0 output
• FTM2 FAULT1 = CMP1 output
• FTM3 FAULT0 = FTM3_FLT0 pin or CMP0 output
3.8.2.6
FTM Hardware Triggers
The FTM synchronization hardware triggers are connected in the chip as follows:
Chapter 3 Chip Configuration
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 113
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