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Rabbit 6000 User’s Manual
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344
30.2 Dependencies
30.2.1 I/O Pins
Each PWM channel can be output on up one of three pins, which can be selected via the parallel port alter-
nate output registers.
30.2.2 Clocks
The PWM counter is clocked from the output of Timer A9 which can use both Timer A12 (TAT12R) and
the Timer A prescaler (TAPR) as prescalers. See 16.1.1, “Block Diagram” for details.
30.2.3 Other Registers
30.2.4 Interrupts
The PWM can generate an interrupt for every PWM counter rollover, every second rollover, every fourth
rollover, or every eighth rollover. This option is selected in PWL1R. The interrupt request is cleared by a
write to any PWM register.
The PWM interrupt vector is in the IIR at offset 0x170. It can be set as Priority 1, 2, or 3 by writing to
PWL0R.
PWM
Output Pins
Channel 0
PC4, PD4, PE4, PF4, PG4, PH4
Channel 1
PC5, PD5, PE5, PF5, PG5, PH5
Channel 2
PC6, PD6, PE6, PF6, PG6, PH6
Channel 3
PC7, PD7, PE7, PF7, PG7, PH7
Register
Function
TAT9R
Time constant for PWM clock
TAT12R
Optional predivider for Timers A8-11.
TAECR
Enable for Timer A12 prescaling.
TAPR
Timer A prescaler.
PCFR, PCAHR
PDFR, PDAHR
PEFR, PEAHR
PFFR, PFAHR
PGFR, PGAHR
PHFR, PHAHR
Alternate port output selection
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