MCS11 datasheet(53/108 Pages) PADAUK

53 / 108 page

MCS11

ADC-Type Enhanced FPPA

TM Controller

Page 53 of 108

PDK-DS-MCS11_v020 – Apr. 20, 2018

5-17 10-BIT PWM generator

5-17-1. PWM Waveform

A PWM output waveform (Fig. 5-17-1) has a time-base (TPeriod = Time of Period) and a time with output high

level (Duty Cycle). The frequency of the PWM output is the inverse of the period (fPWM = 1/TPeriod), the

resolution of the PWM is the clock count numbers for one period (N bits resolution, 2

N × T

clock = TPeriod).

Fig. 5-17-1 PWM Output Waveform

5-17-2. Hardware and Timing Diagram

One 10-bit hardware PWM generator is built inside the MCS11; Fig. 5-17-2 shows its hardware diagram.

The clock source can be IHRC or system clock and output pin can be PA2, PA3, PA4, PA6 or PA7 via

pwmc register selection. The period of PWM waveform is defined in the PWM upper bond high and low

registers, the duty cycle of PWM waveform is defined in the PWM duty high and low registers.

Fig. 5-17-2 Hardware Diagram of 10-bit PWM Generator

Period

Duty Cycle

‧‧‧‧‧‧‧

clock

N bit resolution

pwmc.0

Pre-

scalar

1, 4,

16, 64

pwms[6:5]

Scalar

1 ~ 31

pwms[4:0]

10-bit PWM

down-counter

pwmc[3:1]

pwmc.5

IHRC

clock

CLK

System

clock

PA6

PA7

PA3

PA4

PWM reset

pwmc.1

PWM enable

pwms.7

Duty Value

(High)

Duty Value

(Low)

Duty Value

Low Buffer

8 bits

2 bits

wr_pwmdth

wr_pwmdtl

Duty Value

Buffer

(10 bits)

PWM counter

upper bond

(high)

8 bits

2 bits

wr_pwmcubh

wr_pwmcubl

upper-bound

(10 bits)

PWM counter

upper bond

(low)

Equal ?

reload

compare &

Output

control

PWM

interrupt

selection

PWM

interrupt

mode

pwms.7

PWM

interrupt

request

10-bit or 11-bit

pwmc.0

Pre-

scalar

1, 4,

16, 64

pwms[6:5]

Scalar

1 ~ 31

pwms[4:0]

10-bit PWM

down-counter

pwmc[3:1]

pwmc.5

IHRC

clock

CLK

System

clock

PA6

PA7

PA3

PA4

PWM reset

pwmc.1

PWM enable

pwms.7

Duty Value

(High)

Duty Value

(Low)

Duty Value

Low Buffer

8 bits

2 bits

wr_pwmdth

wr_pwmdtl

Duty Value

Buffer

(10 bits)

PWM counter

upper bond

(high)

8 bits

2 bits

wr_pwmcubh

wr_pwmcubl

upper-bound

(10 bits)

PWM counter

upper bond

(low)

Equal ?

reload

compare &

Output

control

PWM

interrupt

selection

PWM

interrupt

mode

pwms.7

PWM

interrupt

request

10-bit or 11-bit

MCS11 Datasheet(PDF) 53 Page - PADAUK Technology.

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