668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 302
668-0011
Manufacturer Part Number
668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0011
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1043
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Part Number:
668-0011
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B.1.13 Pulse Width Modulator Improvements
Several new features have been added to the pulse width modulator. First, a new PWM
interrupt can be set up to be requested on every PWM cycle, every other cycle, every
fourth cycle, or every eighth cycle. The setup for this interrupt is done in the PWL0R and
PWL1R registers.
Options are available to suppress the PWM output for seven-of-eight, three-of-four and
one-of-two iterations of the PWM counter The one-of-eight option works nicely with R/C
servos, which require a 1 ms to 2 ms pulse width and a 20 ms period. This option gives the
full resolution for the pulse width while still meeting the period requirements. The one-of-
four and one-of-two options can be used to create more virtual PWM channels using soft-
ware to multiplex the PWM outputs. There is a separate option to only generate an inter-
rupt during the active iteration of the PWM count. The timing is shown below.
Figure B-21. PWM Interrupt and Output Timing
292
Rabbit 3000 Microprocessor User’s Manual
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