Datasheet

Figure 48-4. Normal Frequency Operation
COUNT
MAX
TOP
ZERO
CCx
WO[x]
Direction ChangePeriod (T) COUNT Written
"reload" update
"clear" update
"match"
Match Frequency Generation (MFRQ)
For Match Frequency Generation, the period time (T) is controlled by the CC0 register instead of PER or
MAX. WO[0] toggles on each Update condition.
Figure 48-5. Match Frequency Operation
COUNT
MAX
CC0
COUNT WrittenDirection Change
Period (T)
ZERO
WO[0]
"reload" update
"clear" update
Normal Pulse-Width Modulation Operation (NPWM)
NPWM uses single-slope PWM generation.
For single-slope PWM generation, the period time (T) is controlled by the TOP value, and CCx controls
the duty cycle of the generated waveform output. When up-counting, the WO[x] is set at start or compare
match between the COUNT and TOP values, and cleared on compare match between COUNT and CCx
register values. When down-counting, the WO[x] is cleared at start or compare match between the
COUNT and ZERO values, and set on compare match between COUNT and CCx register values.
The following equation calculates the exact resolution for a single-slope PWM (R
PWM_SS
) waveform:

PWM_SS
=
log(TOP+1)
log(2)
The PWM frequency (f
PWM_SS
) depends on TOP value and the peripheral clock frequency (f
GCLK_TC
), and
can be calculated by the following equation:

PWM_SS
=

GCLK_TC
N(TOP+1)
Where N represents the prescaler divider used (1, 2, 4, 8, 16, 64, 256, 1024).
Match Pulse-Width Modulation Operation (MPWM)
In MPWM, the output of WO[1] is depending on CC1 as shown in the figure below. On every overflow/
underflow, a one-TC-clock-cycle negative pulse is put out on WO[0] (not shown in the figure).
SAM D5x/E5x Family Data Sheet
TC – Timer/Counter
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1719