NUC505-YO2Y datasheet(91/130 Pages) NUVOTON

91 / 130 page

NUC505

July. 26, 2018

Page 91 of 130

Rev.1.08

PWM Generator and Capture Timer (PWM)

6.6

6.6.1

Overview

The NUC505 series has one PWM generator that can support four channels PWM output or four

channels input capture sharing the same pins (PWM_CH0/ PWM_CH1/PWM_CH2/PWM_CH3).

The PWM generator has a 16-bit PWM counter and comparator, and the PWM generator

supports two standard PWM output modes: Independent output mode and Complementary output

mode with 8-bit Dead-time generator. Each mode can be used as a timer and issues interrupt

independently. In addition, It also has an 8-bit prescaler and clock divider with 5 divided

frequencies (1, 1/2, 1/4, 1/8, 1/16) to support wide range clock frequency of PWM counter. For

PWM output control unit, it supports polarity output function.

The PWM generator also supports input capture function. It supports latch PWM counter value to

corresponding register when input channel has a rising transition, falling transition or both

transition is happened.

After the capture feature is enabled, the capture always latches PWM-counter to RCAPDATn

when input channel has a rising transition and latched PWM-counter to FCAPDATn when input

channel has a falling transition. Capture channel 0 interrupt is programmable by setting CRLIEN0

(PWM_CAPCTL01[1]) (Rising latch Interrupt enable) and CFLIEN0 (PWM_CAPCTL01[2]) (Falling

latch Interrupt enable) to determine the condition of interrupt occur. Capture channel 1 has the

same feature by setting CRLIEN1 (PWM_CAPCTL01[17]) and CFLIEN1 (PWM_CAPCTL01[18]).

The

capture

channel

has

the

same

feature

setting

CRLIEN2

(PWM_CAPCTL23[1]),CFLIEN2 (PWM_CAPCTL23[2]) and CRLIEN3 (PWM_CAPCTL23[17]),

CFLIEN3 (PWM_CAPCTL23[18]) respectively. Whenever Capture issues Interrupt 0/1/2/3, the

PWM counter 0/1/2/3 will be reload at this moment.

There are only four interrupts from PWM. PWM 0 and Capture 0 share the same interrupt; PWM 1

and Capture 1 share the same interrupt and so on. Therefore, PWM function and Capture

function in the same channel cannot be used at the same time.

6.6.2

Features

PWM function features

6.6.2.1

 Supports 4 PWM output channels with 16-bit resolution

 Supports 8-bit prescaler and clock divider

 Supports 4 PWM interrupts

 Supports One-shot or Auto-reload PWM counter operation mode

 Supports 8-bit Dead-time

Capture function features

6.6.2.2

 Supports 4 capture input channels with 16-bit resolution

 Supports rising or falling capture condition

 Supports 4 Capture interrupts

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