20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 302

• Manufacturer Part Number: 20-668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0011

• 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
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 55.5 MHz
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Number Of Programmable I/os: 56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 316-1061

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
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Rabbit 3000 Microprocessor User’s Manual