HPWM on second half

[lerameur]

Rmteo..
you mentionned earlier

"A better solution would be to use a PIC with an ECCP (Enhanced Compare Capture) module. Many of the newer PIC's have this feature. Set it up to operate in Half-Bridge mode and you will get a PWM signal on the P1A pin and a complementary signal on P1B. Plus you can control the programmable dead-band delay which is used to prevent shoot-through current in half-bridge devices."

I understand what a half bridge is, but I am bit confused about configuring the pic in half bridge mode.. what do you mean by that?

So far I added an inverter at my HPWM output, I would still like to get two ports, I ordered chips which includes the eccp mode.

K

[rmteo]

From the PIC16F690 datasheet:

REGISTER 11-1: CCP1CON: ENHANCED CCP1 CONTROL REGISTER
bit 7-6 P1M<1:0>: PWM Output Configuration bits
If CCP1M<3:2> = 00, 01, 10:
xx = P1A assigned as Capture/Compare input; P1B, P1C, P1D assigned as port pins
If CCP1M<3:2> = 11:
00 = Single output; P1A modulated; P1B, P1C, P1D assigned as port pins
01 = Full-Bridge output forward; P1D modulated; P1A active; P1B, P1C inactive
10 = Half-Bridge output; P1A, P1B modulated with dead-band control; P1C, P1D assigned as port pins
11 = Full-Bridge output reverse; P1B modulated; P1C active; P1A, P1D inactive

[Bruce]

Here's an example for the 12F615.

@ DEVICE PIC12F615, MCLR_OFF, IOSCFS_4MHZ, INTRC_OSC_NOCLKOUT, WDT_OFF, BOD_OFF, PROTECT_OFF
    
DEFINE OSC 4
duty VAR WORD

ANSEL   = 0	            ' 12F615 Set all pins to digital
CMCON0 = 0
OPTION_REG = 0          ' Disable internal pullups
WPU = 0                 ' 12F615 Individual pull-ups disabled
VRCON   = 0             ' Internal Vref disabled

    TRISIO = %00111010  ' GPIO.0 = P1B, GPIO.2=P1A outputs
    PR2 = 82            ' Set PWM for approximately 12kHz
    CCP1CON = %10001100 ' PWM mode; P1A active-high; P1B active-high
    T2CON = %00000100   ' %00000110 = TMR2 ON 1:16 prescale
    PWM1CON = %10000001 ' min dead-band time
    
    Duty = 166          ' Roughly 50% duty cycle
    CCP1CON.4 = duty.0
    CCP1CON.5 = duty.1
    CCPR1L = DUTY >> 2
                                
MAIN:
    GOTO  MAIN
    
    End

This has a 1uS dead-band with roughly 12kHz PWM, and each output is the compliment of
the other.