SN8F5708 datasheet(102/204 Pages) SONIX

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SN8F5708 Series

PWM

Datasheet Rev. 2.4

102

PWCH[1:0] bits. When output one pulse PWM function, we must be set PWnPO = PWnEN=1.

When one pulse PWM output signal synchronize finishes, the PWM channel exchanges from GPIO

to PWM output. When one pulse PWM output finishes, PWnEN = 0, the PWM channel returns to

GPIO mode and last status.

One Pulse

PWM Output

PWnPO=1 and PWnEN=1.

PWnEN=0 automatically.

The pin exchanges to last

GPIO mode (output low).

PWnEN=1

PWnEN=0

PWnEN=1

PWnEN=0

PWnEN=1

PWnEN=0

High impendence (floating)

PWnEN=0 automatically.

The pin exchange to last

GPIO mode (input).

PWnPO=1 and PWnEN=1.

PWnEN=0 automatically.

The pin exchanges to last

GPIO mode (output high).

One Pulse

PWM Output

One Pulse

PWM Output

16.3

Inverse and Dead Band

The PWM builds in inverse output function. The PWM has one inverse PWM signal as PWNV =1.

When PWNV = 1, the PWn outputs the inverse PWM signal of PWMn. When PWNV = 0, the PWn

outputs the non-inverse PWM signal of PWMn. The inverse PWM output waveform is below

diagram.

PWM Cycle=PWnY

PWM Duty=PWnD

PWMn1

(PWNVn1=1)

PWnA

PWMn1

(PWNVn1=0)

PWnB

PWnA

PWMn0

(PWNVn0=0)

The PWM dead band occurs in PWM high pulse width, and the dead band period is programmable

from PWnA and PWnD-PWnB registers. The dead band period is symmetrical at left-right terminal

of PWM pulse width or not. If the bead band period is longer than PWM duty, the PWM is no

output.

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