NXP Semiconductors MC9S08SU16 Reference Manual page 354

Functional description
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PWTEN
FCTLE(=1)
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Figure 20-3. PWT normal measurement with FCTLE = 1
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PWTIN
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PWTOV
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TGL
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CNTH:L
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Figure 20-4. PWT measurement overflows at high level with FCTLE = 1
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PWTEN
PWTIN
PWTOV
TGL
LVL
CNTH:L
Figure 20-5. PWT measurement overflows with PWTIN toggles
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MC9S08SU16 Reference Manual, Rev. 5, 4/2017
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NXP Semiconductors