NXP Semiconductors MKW01Z128, Reference Manual

Page: 660 / 884

27.4.2 Prescaler
The selected counter clock source passes through a prescaler that is a 7-bit counter.
The value of the prescaler is selected by the PS[2:0] bits. The following figure shows an
example of the prescaler counter and TPM counter.
0
0
0 0 0
0 0
0 0 0 0 0 1
1 1 2 2 3 3
1 1 1 1 1 1 1 1
1
selected input clock
prescaler counter
timer module counting is up.
PS[2:0] = 001
CNTIN = 0x0000
timer module counter
Figure 27-2. Example of the Prescaler Counter
27.4.3 Counter
The TPM has a 16-bit counter that is used by the channels either for input or output
modes.
The counter updates from the selected clock divided by the prescaler.
The TPM counter has these modes of operation:
• up counting (see Up counting )
• up-down counting (see Up-down counting )
27.4.3.1 Up counting
Up counting is selected when SC[CPWMS] = 0.
The value of zero is loaded into the TPM counter, and the counter increments until the
value of MOD is reached, at which point the counter is reloaded with zero.
The TPM period when using up counting is (MOD + 0x0001) × period of the TPM
counter clock.
The TOF bit is set when the TPM counter changes from MOD to zero.
Chapter 27 Timer/PWM Module (TPM)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc. 529