PFS172 datasheet(47/92 Pages) PADAUK

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PFS172

8bit MTP MCU with 8-bit ADC

Page 47 of 92

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

Example 3:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0011_1111, K=63

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

 PWM output keep high

 duty of output = [(63+1) ÷ 64] × 100% = 100%

Example 4:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0000_0000, K=0

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

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

 duty = [(0+1) ÷ 64] × 100% =1.5%

5.7.4

Complementary PWM with Dead Zones

User can get complementary PWM with dead zones by employing TM2 and TM3. Here provide an

example in which duty cycle and dead time are adjustable.

//------- These two parameters need be defined when T(PWM) = 256 us ----------

#define

PWM_pulse

70 us; Adjust it for a different duty cycle of TM2/TM3.

#define

dead_zone

30 us; Adjust it for the best dead time.

//--------Parameters for switching duty cycle -----------------------------------

#define

PWM_Pulse_a

100

100 us; Adjust it for a different duty cycle of TM2/TM3

#define

PWM_Pulse_b

160

160 us; Adjust it for a different duty cycle of TM2/TM3

#define

t_delay

500

500 us; Switching time of duty cycle

void

FPPA0 (void)

{

// SYSCLK must quicker than Timer2’s clock. Here set SYSCLK=2MHz to capture Tm2ct = 0.

.ADJUST_IC SYSCLK=IHRC/8, IHRC=16MHz, VDD=3.3V, Init_ram;

//******Generate complementary PWM with dead zones in a fixed-duty cycle****************

//------Set the counter upper bound, duty cycle and TMXCT -----------

$ TM2S 8BIT,/4,/4

16MHz /4 /4 /256

= 1MHz / 256 =

256 us

TM2B

PWM_pulse - 1;

$ TM3S 8BIT,/4,/4

16MHz /4 /4 /256

TM3B

PWM_pulse + 2 * dead_zone - 1;

TM2CT

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