W79E825A Datasheet, PDF (100/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
Start
Initialize PWM function
1. Set PWM Control Regs
2. Set PWM brake output pattern(PWMnB)
3. Enable brake function
(BKEN,BPEN,BKCH)=(1,1,0)
1. Clear 10-bit PWM counter
CLRPWM=1
2. Reload PWMP & PWM registers
3. Enable brake function
(BKEN,BPEN,BKCH)=(1,1,0)
PWM starts running
No
Brake occurs?
Yes
1. PWMn output=PWMnB
2. H/W set BKF=1 & PWMRUN=0
3. S/W switch to S/W Brake
(BKEN,BPEN,BKCH)=(1,0,0)
4. Set PWMn comparator output =
PWMnB or a given pattern
Brake pin is
Yes
asserted?
No
1. Clear BKF
PWM output=PWM comparator output
2. Re-start PWM Running by setting
PWMRUN=1; load bit=1
End
Figure 23-2: PWM Brake Function
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