SN8F5708 datasheet(100/204 Pages) SONIX

100 / 204 page

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SN8F5708 Series

PWM

Datasheet Rev. 2.4

100

16 PWM

The PW1/PW2/PW3 timer respectively includes a 16-bit binary up 2-channel PWM, and one pulse

PWM function functions. By the counter reaches the up-boundary value (PW1Y/PW2Y/PW3Y), it

clears its counter and triggers an interrupt signal. Each PWM’s duty cycle is controlled by

PW1D/PW2D/PW3D register.

The PWMs also support one pulse output signal which can disables itself by the end of first PWM

cycle. Thus, only one pulse would be generated in this condition. The PWM has two programmable

channels shared with GPIO pins and controlled by PWCH[1:0] bit. The output operation must be

through enabled each bit/channel of PWCH[1:0] bits. The enabled PWM channel exchanges from

GPIO to PWM output. When the PWCH[1:0] bits disables, the PWM channel returns to last status

of GPIO mode. The PWM build in IDLE Mode wake-up function if interrupt enable. When PWM

timer overflow occurs (counts from PWnY-1 to PWnY), PWMnF would be issued immediately which

can read/write by firmware. PWMn interrupt function is controlled by EPWMn.

16-Bit Binary Up

Counting Counter

PWM Rate

PWnEN

PWM

OUT

Clear to 0x0000

PWnPO

fosc

PWMnF

PWnEN

Divider

÷1 to ÷128

16-Bit

Comparator

PWnD

Data Buffer

Reload

PWnDH/PWnDL

16-Bit

Comparator

PWnY

Data Buffer

PWMnF

Reload

PWnYH/PWnYL

PWMnF

Pulse

Control

GPIO

PWnEN

PWCHn0

PWNVn0

PWMn0

PWMn1

Dead Band

Control

PWNVn1

PWnEN

PWCHn1

PWnBH/PWnBL

PWnA

PWM Time Out

16.1

General PWM

PWn timer builds in PWM function controlled by PWnEN and PWCH[1:0] bits. PWMn0, PWMn1 are

output pins. The PWMn0, PWMn1 output pins are shared with GPIO pin controlled by PWCH[1:0]

bits. When output PWM function, we must be set PWnEN =1. When PWM output signal

synchronize finishes, the PWM channel exchanges from GPIO to PWM output. When PWnEN = 0,

the PWM channel returns to GPIO mode and last status. PWM signal is generated from the result

of PWnY and PWnD comparison combination. When PWnC counts from 0x0000, the PWM outputs

high status which is the PWM initial status. PWnC is loaded new data from PWnY register to decide

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