PFS172 datasheet(46/92 Pages) PADAUK

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PFS172

8bit MTP MCU with 8-bit ADC

Page 46 of 92

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

The sample program for using the Timer2 to generate PWM waveform from PA3 is shown as below:

void

FPPA0 (void)

{

.ADJUST_IC

SYSCLK=IHRC/2, IHRC=16MHz, VDD=5V

tm2ct = 0x00;

tm2b = 0x7f;

tm2s = 0b0_00_00001;

8-bit PWM, pre-scalar = 1, scalar = 2

tm2c = 0b0001_10_1_0;

system clock, output=PA3, PWM mode

while(1)

{

nop;

}

5.7.3

Using the Timer2 to generate 6-bit PWM waveform

If 6-bit PWM mode is selected, it should set tm2c[1]=1 and tm2s[7]=1, the frequency and duty cycle of

output waveform can be summarized as below:

Frequency of Output = Y ÷ [64 × S1 × (S2+1) ]

Duty of Output = [( K＋1 ) ÷ 64] × 100%

Where,

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

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

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

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

Users can set Timer2 to be 7-bit PWM mode instead of 6-bit mode by using TMx_Bit code option. At that

time, the calculation factors of the above equations become 128 instead of 64.

Example 1:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0001_1111, K=31

tm2s = 0b1_00_00000, S1=1, S2=0

 frequency of output = 8MHz ÷ ( 64 × 1 × (0+1) ) = 125KHz

 duty = [(31+1) ÷ 64] × 100% = 50%

Example 2:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0001_1111, K=31

tm2s = 0b1_11_11111, S1=64, S2=31

 frequency of output = 8MHz ÷ ( 64 × 64 × (31+1) ) = 61.03 Hz

 duty of output = [(31+1) ÷ 64] × 100% = 50%

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