20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 150

• 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

Several types of data encoding are available in HDLC mode: NRZ, NRZI, biphase-level
(Manchester), biphase-space (FM0), and biphase-mark (FM1). IrDA-compliant RZI
encoding is also available in the HDLC mode; it reduces the bit widths to one quarter the
normal width, which allows the serial-port signal to be connected directly to an IrDA
transceiver.
If an internal clock is selected, the serial port data clocks can be generated from the appro-
priate 8-bit timer (Timer A2 for Serial Port E and Timer A3 for Serial Port F). In the
HDLC mode, the bit data rate is equal to the data clock rate divided by 16.
When using an external clock, a 1× (same speed as the data rate) clock is supported. In this
case, the maximum data rate is 1/6 of the peripheral clock rate. The receive clock is gener-
ated from the transitions in the data stream via a digital phase-locked loop (DPLL). The
timing of this synchronization is adjusted with each incoming transition, allowing for
tracking if the two external clocks differ slightly in frequency. For more on the clock syn-
chronization and data encoding, see Section 18.3.3.
18.1.1 Block Diagram
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Rabbit 3000 Microprocessor User’s Manual