SYNPWM datasheet(26/57 Pages) FEELING

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FM8P73B

Web site: http://www.feeling-tech.com.tw

Rev1.0 Nov 20, 2013

P.26/FM8P73B

FEELING

TECHNOLOGY

2.4.2

Sync PWM mode

In Sync PWM mode, the PWM has two outputs. PWM1N Non overlap time can be adjusted from SYNPWM<1:0>,

please refer to the sample program and the timing diagram below.

Example 2.3: PWM1 Setting (Sync mode)

Address

Code

#include

<8P73B.ASH>

…

//Set PWM1 Period

MOVIA

0x61

n+1

MOVAR

T1CON

;Set source: 4MHz IRC (250nS) Prescaler 1:2

n+2

MOVIA

0x80

n+3

MOVAR

PWM1CON

;Set PWM interrupt rate 1:1, output on IOA0

n+4

MOVIA

0x0F

n+5

MOVAR

T1LA

;Set period (0x0F down count to 0x00)

;Period time = 250ns x 16 x 2 = 8uS

//Set PWM1 Duty

n+6

MOVIA

0x61

n+7

MOVAR

T2CON

;Set source 4MHz IRC (250nS) Prescaler 1:2

n+8

MOVIA

0x07

n+9

MOVAR

T2LA

;Set Duty (0x07 down count to 0x00)

;Duty time = 250ns x 8 x2 = 4uS

//Set Sync PWM

n+10

MOVIA

0x82

n+11

MOVAR

SYNPWM

;Set PWM1P is normal, IOA1 is PWM1N output

;Non overlap time = 3/2 cycle time

n+12

BSR

T1CON,T1EN_B

;Start PWM1

n+13

MOVIA

0x81

n+14

MOVAR

INTEN

;Enable global & PWM1 interrupt

n+15

CLRR

INTFLAG

;Clear interrupt flag

Note: The PWM duty (Timer2) must be smaller than PWM period (Timer1).

Figure 2.6: Sync PWM Waveform

TMR1 counter :

Sync PWM1P output :

Sync PWM1N output :

TMR2 counter :

PWM Period

PWM Duty

0D 0C

Non Overlap ti me

=3/2 cycl e

SYNPWM Datasheet(PDF) 26 Page - Feeling Technology Corp.

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