Rabbit 6000 User’s Manual
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345
30.3 Operation
The following steps explain how to set up a PWM channel.
1. Configure Timer A9 via TAT9R to provide the desired PWM clock frequency.
2. Configure PWLxR to select whether to spread the PWM output throughout the cycle.
3. Configure PWLxR to select whether to suppress the PWM output.
4. Configure the duty cycle by writing to PWLxR and PWMxR. Note that any changes to these regis-
ters while the PWM is active will not take effect until the next counter rollover.
30.3.1 Handling Interrupts
The following steps explain how an interrupt is set up and used.
1. Write the vector to the interrupt service routine to the internal interrupt table.
2. Configure PWL0R to select the PWM interrupt priority and PWL1R to select PWM interrupt sup-
pression (if an interrupt is desired).
The following actions occur within the interrupt service routine.
•
Any PWM values may be updated.
•
The interrupt request is cleared by writing to any PWM register.
30.3.2 Example ISR
A sample interrupt handler is shown below.
pwm_isr::
push af ; save used registers
; load next PWM value into HL here
ioi ld (PWL0R), hl ; update the PWM value in PWL0R and PWM0R
; note that interrupt request is also
; cleared by register write above
pop af ; restore used registers
ipres
ret
Содержание 6000
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