PFS172 datasheet(43/92 Pages) PADAUK

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PFS172

8bit MTP MCU with 8-bit ADC

Page 43 of 92

PDK-DS-PFS172-EN_V000-May 8, 2020

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 0 – Period Mode

Event Trigger

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 8-bit PWM Mode

Time

Counter

0x3F

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 6-bit PWM Mode

Event Trigger

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 0 – Period Mode

Event Trigger

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 8-bit PWM Mode

Time

Counter

0x3F

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 6-bit PWM Mode

Event Trigger

Fig.11: Timing diagram of Timer2 in period mode and PWM mode (tm2c.1=1)

A Code Option GPC_PWM is for the applications which need the generated PWM waveform to be controlled

by the comparator result. If the Code Option GPC_PWM is selected, the PWM output stops while the

comparator output is 1 and then the PWM output turns on while the comparator output goes back to 0, as

shown in Fig. 12.

Fig.12: Comparator controls the output of PWM waveform

5.7.1

Using the Timer2 to generate periodical waveform

If periodical mode is selected, the duty cycle of output is always 50%; its frequency can be summarized

as below:

Frequency of Output = Y ÷ [2 × (K+1) × S1 × (S2+1) ]

Where,

Y = tm2c[7:4] : frequency of selected clock source

K = tm2b[7:0] : bound register in decimal

S1 = tm2s[6:5] : pre-scalar (S1= 1, 4, 16, 64)

S2 = tm2s[4:0] : scalar register in decimal (S2= 0 ~ 31)

PWM Output

Comparator

Output

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