
Buffer of PPH:L
Buffer of NPH:L
PPH:L
NPH:L
16-bit Counter
edge detect and capture logic
Read buffer upload control
PWTRDY
CPU BUS
PWTIN
Read Data
Logic
Clear PWTRDY
Read/write
Figure 43-7. Buffering mechanism of pulse width register
When PWT completes any pulse width measurement, a signal is generated to reset
PWTxCNTH:L and the clock pre-scaler output after the data has been uploaded to the
pulse width registers.. To assure that there is no missing count, the PWTxCNTH:L and
the clock pre-scaler output are reset in a bus clock cycle after the completion of a pulse
width measurement.
Reset overview
43.6.1 Description of reset operation
PWT soft reset is built into PWT as a mechanism used to reset/restart the pulse width
timer. The PWT soft reset is triggered by writing 1 to the PWTSR bit. (This bit always
reads 0). Unlike reset by the CPU, the PWT reset does not restore everything in the PWT
to its reset state. The following occurs
1. The PWT counter is set to 0x0000
43.6
Reset overview
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
1158
NXP Semiconductors
Summary of Contents for KE1xF Series
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